So... a thousand years in the future there is a second Hitleresque guy, who looks more or less the same, uses the same symbol, and has no idea who the guy standing in front of him is.
So we're supposed to believe that a second Nazi Party, with the same symbol and a leader who looks exactly like the first one, and that it was a complete coincidence; that this group had no connection whatsoever to the first group, so how would they even know the original Hitler if they saw him.