Nazism is still a shunned no-go, and the AfD knows that (and regularly accuses others of being Nazis). The way I see it, its officials are still Nazis though, but they get around acknowledging that by just positioning themselves as counter-culture opposition to progressive movements, which is great at mobilizing a united front of anyone who feels attacked by any part of progressivism. Meanwhile, they also covertly appease other Nazis and the extreme right through dogwhistles and the like. The anti-progressive voters just ignore or tolerate this. This combination sadly proves successful. When they start building the camps, of course everyone should've known they're Nazis, but no one thinks that far even though it's their policies' logical conclusion.