I think the misconception you have is that nazism means “WW2 anti-semitism” for you. The education on the topic that we get in many European countries goes deeper than that.

Would it be better if they called Elon a fascist? He did the fascist salute, after all. And as other commenters have said: if it endorses authoritarian far-right parties like a duck, has controversial white-supremacist parents like a duck, and does the fascist salute like a duck, at which point do we start wondering wether he’s actually a duck?