Could You imagine a German writer who writes and publish a fiction story about some (completely fictive of cause) laboratory created during Hitler’s times in some German city with fictive name (for example Tannenwald) where special chambers were constructed to examine how poison gas impact human organism and then claiming that all German concentrate camps gas chambers history is a fiction just because every word of dialogue in his story is a fiction?

In my opinion it might happen only if
* He has no knowledge about Nazi concentrate camps at all
* Or he think that this history is a fiction
* Or he think that gas chambers were OK

But I cannot imagine such German writer because Germans are well informed about German Nazi crimes and what they really want is that world forget this history as soon as possible.

Unfortunately it is not so with Russian writers and Russian Communists crimes history.