Sedlar was criticized for nationalism and politicization in his films. On 4 April 2016 his documentary "Jasenovac - The Truth" premiered. The documentary is about the alleged crimes committed by the communist authorities of the SFR Yugoslavia in the Jasenovac concentration camp between 1945 and 1951 following the Second World War, which, as claimed in the documentary, were covered up. The film also downplays and denies the extent of The Holocaust in Croatia and the World War II-era Genocide of Serbs in Croatia, contending that the number of victims were exaggerated through post-war Yugoslavian communist propaganda. At the end of the documentary, Sedlar leaves the alleged communist crimes, moves to the modern era and mentions various leftists who allegedly "cover up communist crimes" (naming Presidents Stjepan Mesić and Ivo Josipović, and Serb MP Milorad Pupovac) as well as various journalists who allegedly help them (Miljenko Jergović, Jurica Pavičić, Ante Tomić, Davor Butković and others), which was considered tendentious and irrelevant to the theme of the documentary, as well as a way of labeling people he considered inadequate. Slavko Goldstein said that the documentary was "full of half-truths, lies and forgeries", and that the end in which some public figures are named was a "direct arrest warrant and indictment against individuals."