There is even a German movie "Er ist wieder da" in which Hitler returns to modern day Germany. That was not even banned or censored because it was satire. But ride on a motorbike looking remotely as Hitler you are in big trouble in Germany and Austria. The letter was found out by Dutch TV host Rob Muntz who thought is funny to dress up like Hitler whilst attending a congress of the conservative FPÖ party. Again it was aired in the Netherlands as "satire΅.