I wonder if it'd help to ask it to write the noun with the article. I just tried it now - I asked it to list the top 100 German "der" nouns, then asked it to repeat the list but with the article. That made it obvious which ones were wrong!
It was unwilling to write "Der Jahr" when "Das Jahr" is correct.
The list was mostly correct, but yes it added nouns that were not "der" nouns into the list.
It then attempted to correct the list and failed at correcting it.
In terms of output, it also didn't want to give a list of 200, but I did manage to get a list of around 100 back.