Man, that would be a fascinating experiment. Would it be able to predict who wins and when? Would it be able to predict the Cold War?
But we know Hitler has a Time Machine that goes forward, he doesn’t need to return to use that knowledge as he already has a timeline here to use. Definitely risks involved here.
If you build an oracle that tells you who wins the war that far in the future, you build a simulator that allows anyone to win any war. Everything is dual use.