While there were far more evil men working for him in his Nazi regime, it was his call as to what the party did, which makes him unforgiveable in my opinion.
I'm not sure of your question of fact is concerned, but yes, he was an evil man by any definition who had a lot of other personality defects as well.
As for forgiveness, that could only come from those he had killed, tortured, or injured by his attacks on sovereign nations. I'm sure some religious types individually forgave him (better people than I for sure), but on the whole, the world hasn't, won't ever, nor should it.
What I mean is that I wouldn't be as generous and forgive Hitler and at the same time am also conceding that are probably better people than I who could forgive him. I'm a decent human who would never hurt any innocent human or animal, but anyone asking me to forgive Hitler is simply asking too much from me.
While saying that, I am not speaking for anyone but myself, but I suspect that most people in the world will side with me on this subject.
In any case, it's up to those who were directly hurt by him to forgive or not forgive him.
Well... It wasn't too serious then again more of a curiosity and I was partially inspired here by the theme of forgiveness demonstrated in the film "Dead Man Walking" (1995) - would Sister Helen cater to Hitler in such sense were HE happen to be in his arms instead of Matthew Poncelet?
Who cares? He is dead. Dead, he is revered by a few losers and loonies and reviled by EVERYONE else. If it has made a few people more comfortable, for religious or philosophical reasons, to forgive him... Well, like I said; who cares?