I don't think so
In Ham on Rye, Bukowski wrote:
When I was a kid and Max Schmeling K.O.'d Joe Louis, I had run out into the street looking for my buddies, yelling "Hey, Max Schmeling K.O.'d Joe Louis!" And nobody answered me, nobody said anything, they had just walked away with their heads down. [end.]
Others may have posted similar thoughts, but I'd say there were times when Bukowski appeared to strongly identify with German culture and his enthusiasm blurted out of him; but I never felt that Buk's identification of things German justified any serious criticism that he was a Nazi in application, outlook or philosophy. Instead, I always felt that he was unconscious of or playing off of other people's reactions, as in the case of Schmeling's victory or Hitler's rise to power. I believe he also wrote childhood stories of the German air ace, Baron von Richthofen. And why shouldn't he, being half-German? It was in his blood. Although he was born in Germany and was there only a short time before coming to America, his mother Katharina was a native German. The German vibe was in his genes and he grew up in it... I also think he enjoyed his visit to Germany with Linda in 1978, and seemed to feel right at home there. Overall, however, I think he made it plain in his writings that he was basically apolitical, including any serious interest in Nazism; it seems ridiculous for anyone to have to point this out... For the critics who hate him - and there are plenty enough out there - the accusations of Bukowski's supposed Nazism is their feeble attempt to cut his reputation down to size and make it seem like he's not worth reading. And the reason why that cheap-shot strategy hasn't worked overall is because the charge isn't true.