Controversial acting credit for Triumph of the Will (1935) - contribution declined

Triumph of the Will is a famous / notorious propaganda documentary about the rising of the Nazi ideology in Germany. It was shot in the 1930s. If you look at the IMDb acting credits, you'll see that two people are listed in the "role" of Adolph Hitler: himself (naturally) and one George Yarid. Now I ignore who Yarid is, but I am sure he was not around in the 30s (I venture to think whoever entered the credit did it as a prank? Not that funny imho). This should be evidence enough that the credit is wrong and has to be deleted. Now I can't possibly find a reference that states that Mr Yarid is *not* in the movie. Yet the thing should be self-explanatory. In spite of this, my contribution: https://contribute.imdb.com/contribution/240725-172621-586000 has been declined as unverifiable. I suggest someone fixes this. Again, it looks like it is a sick joke.