He’s Ivan the Terrible, no wait, he’s someone else. How the heck can you be so sure who this guy is when our government spent a lot of money to say he’s Person X but changes and now says he’s Person Y?
We can be sure because the documentary evidence recovered from Soviet archives is corroborated by the documentary evidence gathered by Western law enforcement agencies and by the inconsistencies in Demjanjuk's own account of his wartime whereabouts.
Our government spent a moderate amount of money to prove that a man who fraudulently entered our country was in fact a war criminal. And, guess what? It turns out that he was actually a war criminal.