There werent a lot of black people in germany itself, they did sterilize biracial germans, and most others simply died in basically „unorganized“ murder sprees, so nazi citizens took upon themselves to „get rid“ of non-whites knowing that the state wont persecute them.

Given how racialized communism/socialism was yeah they actually should be listed as part of genocide. Leftists were seen as viruses which pollute the nation’s ethnic body with their existence alone and twisted its victims into „jewishness“. In American fascist discourse (white) leftists are also racialized to an extent as they become „vessels“ for foreign/subhuman agents to destroy white america.