Yeah, many corrupt politicians, fascists, murderers and other criminals would love the idea that "the past is not true". I'd bet that the story is fake because

Yeah, many corrupt politicians, fascists, murderers and other criminals would love the idea that "the past is not true". I'd bet that the story is fake because of the conclusion "you can change history". Both of them didn't change the history, they have changed their knowledge about history, which was given to them by third parties.