I'm not sure if you mean anyone, particularly a German, making a film about Schindler, or whether you mean more broadly any German filmmaker addressing the Holocaust.
If it is the latter, you may be interested in this list of films made by various European countries since the Second World War which address Nazi atrocities. You will note that the first German film was made in 1946.
https://en.wikipedia.org/wiki/List_of_Holocaust_films
It would be wrong to think that Germany has not addressed the things that were done. I have a German friend who was a very small child at the end of the war (and still as an adult had nightmares about the bombing of Hamburg) who told me that at school the children were shown films about the concentration camps.