Legislation: European Union 

 The atricle claims: "The European Union has ratified a law "banning incitement to or denial of genocide" (both the Holocaust and the Armenian Genocide)." The source reads: "The European Union has just ratified a law “banning incitement to or denial of genocide” (arguably including both the Holocaust and the Armenian genocide)." Some enthusiasts removed the word arguably when citing the source. 
 Let's have a look at the law itself. 
 Framework decision on combating racism and xenophobia
 Official Press Release
 Certain forms of conduct as outlined below, which are committed for a racist or xenophobic purpose, are punishable as criminal offences: ... public condoning, denying or grossly trivialising crimes of genocide ... as defined in the Statute of the International Criminal Court (Articles 6, 7 and 8) and crimes defined in Article 6 of the Charter of the International Military Tribunal, when the conduct is carried out in a manner likely to incite violence or hatred against such a group or a member of such a group.

 Example: Somebody publicly claims that an act of genocide, the commission of which has been established as a fact by an international court, never happened and was invented by the ethnic group concerned solely for the purpose of being able to claim compensation payments. This allegation would not only deny the genocide committed against the ethnic group concerned, but would also incite hatred against this group. In the future, all Member States would be compelled to criminalise such a case.

 Whether a specific historical crime falls within these definitions must be decided in each concrete case by the court which has jurisdiction. In the case of the Holocaust, for example, this was done by the Nuremberg Tribunal.
 As we see, the law is restricted to cases, when:
 the commission of genocide is established by an international court and
 the denial is carried out in a manner likely to incite violence or hatred
Is the commission of Armenian genocide established by an international court?