Question: What term was use as propaganda but has been confirmed to be reality and the Manfiesto of Ninety-Three was part of it?

Context paragraphs:
Boxcab: A boxcab, in railroad terminology, is a locomotive in which the machinery and crew areas are enclosed in a box-like superstructure (from boxcar).  It is a term mostly used in North America while in Victoria (Australia), such locomotives have been nicknamed "butterboxes" (Victorian Railways second series "E" Class electric locomotives numbered E1102 to E1111).  Boxcabs may use any source of power but most are diesel or electric locomotives. Few steam locomotives are so described but the British SR Leader class was a possible exception.  Most American boxcabs date from before World War II, when the earliest boxcabs were often termed "oil-electrics" to avoid the use of the German name "Diesel" due to propaganda purposes.

Rape of Belgium: The Rape of Belgium was the German mistreatment of civilians during the invasion and subsequent occupation of Belgium during World War I.  The term initially had a propaganda use but recent historiography confirms its reality.  One modern author uses it more narrowly to describe a series of German war crimes in the opening months of the war (August–September 1914).

Manifesto of the Ninety-Three: The "Manifesto of the Ninety-Three" is the name commonly given to a 4 October 1914, proclamation endorsed by 93 prominent German scientists, scholars and artists, declaring their unequivocal support of German military actions in the early period of World War I.  These actions were elsewhere called the Rape of Belgium.  The Manifesto galvanized support for the war throughout German schools and universities, but many foreign intellectuals were outraged.

Political warfare: Political warfare is the use of political means to compel an opponent to do one's will, based on hostile intent.  The term political describes the calculated interaction between a government and a target audience to include another state's government, military, and/or general population.  Governments use a variety of techniques to coerce certain actions, thereby gaining relative advantage over an opponent.  The techniques include propaganda and psychological operations (PSYOP), which service national and military objectives respectively.  Propaganda has many aspects and a hostile and coercive political purpose.  Psychological operations are for strategic and tactical military objectives and may be intended for hostile military and civilian populations.

Irrealism (the arts): Irrealism is a term that has been used by various writers in the fields of philosophy, literature, and art to denote specific modes of unreality and/or the problems in concretely defining reality.  While in philosophy the term specifically refers to a position put forward by the American philosopher Nelson Goodman, in literature and art it refers to a variety of writers and movements.  If the term has nonetheless retained a certain consistency in its use across these fields and would-be movements, it perhaps reflects the word’s position in general English usage: though the standard dictionary definition of "irreal" gives it the same meaning as "unreal", "irreal" is very rarely used in comparison with "unreal".  Thus, it has generally been used to describe something which, while unreal, is so in a very specific or unusual fashion, usually one emphasizing not just the "not real," but some form of estrangement from our generally accepted sense of reality.

Anti-Soviet agitation: Anti-Soviet Agitation and Propaganda (ASA) (Russian: Антисове́тская агита́ция и пропага́нда (АСА) ) was a criminal offence in the Soviet Union.  To begin with the term was interchangeably used with counter-revolutionary agitation.  The latter term was in use immediately after the first Russian Revolution in February 1917.  The offence was codified in criminal law in the 1920s, and revised in the 1950s in two articles of the RSFSR Criminal Code.  The offence was widely used against Soviet dissidents.

Source credibility: Source credibility is "a term commonly used to imply a communicator's positive characteristics that affect the receiver's acceptance of a message."  Academic studies of this topic began in the 20th century and were given a special emphasis during World War II, when the US government sought to use propaganda to influence public opinion in support of the war effort.  Psychologist Carl Hovland and his colleagues worked at the War Department upon this during the 1940s and then continued experimental studies at Yale University.  They built upon the work of researchers in the first half of the 20th century who had developed a "Source-Message-Channel-Receiver" model of communication and, with Muzafer Sherif, developed this as part of their theories of persuasion and social judgement.

Propaganda in the People's Republic of China: Propaganda in the People's Republic of China refers to the use of propaganda by the Communist Party of China to sway domestic and international opinion in favor of its policies.  Domestically, this includes censorship of proscribed views and an active cultivation of views that favor the government.  Propaganda is considered central to the operation of the CPC government.  The common Chinese term "xuānchuán" (宣传) can mean "dissemination", "propaganda", or "publicity".

The System (Nazism): "The System" (German: "Das System") was a derogatory term used by the Nazis to denote contemptuously the Weimar Republic, whose official name was German Reich (Deutsches Reich), and its institutions.  In Nazi publications and propaganda, the word was used in a number of compounds: for example, the period from the German Revolution of 1918–1919 to the Nazi seizure of power (German: "Machtergreifung") in 1933 was called "The time of the System" (German: "Systemzeit") and political opponents of the Nazis from this period were called "System parties", "System politicians" or the "System press".  After the Nazi takeover, the term was quickly adopted to everyday use.

Comptroller of Puerto Rico: The Comptroller of Puerto Rico is a constitutionally-created office charged with carrying out post-audits of the use of public funds in Puerto Rico.  The Comptroller is appointed by the Governor of Puerto Rico and requires the advice and consent of both the Senate of Puerto Rico as well as the Puerto Rico House of Representatives for a term of office of ten years and until a successor is nominated, confirmed and qualified.  Former Comptroller Manuel Díaz Saldaña's was the longest-serving comptroller, having served almost 13 years, until his successor, Yesmín Valdivieso, was appointed by Governor Luis Fortuño, confirmed and sworn in.

Supporting paragraphs: Manifesto of the Ninety-Three Rape of Belgium
Answer: Rape of Belgium