egafd.com

The film list has a movie
Sanitatsgefreiter Neumann
und suggests that it might be the same as the one listed in the IMDb as
Die neuen Abenteuer des Sanitatsgefreiten Neumann

This is not correct, they are different.
The film listed here is in fact a short.

Incidentally, the issue came up in an interview the German genre magazine Splatting Image had with porn director Hans Billian.

Thanks a lot. Did Billian direct the short?

Yes, he did.

Thanks.