This whole thing is ridiculous. Elon isn’t a Nazi and doesn’t support Nazis. If it was a Nazi salute it would completely out of context with the rest of his speech. His salute might slightly resemble a salute that you can find Hitler performing once and never again. You can also only see it at an indirect angle and even then it’s not that similar.
Elon looks like he’s doing a football celebration. He salute is super fast, and he shifts his entire body and head into it. He is excited and celebrating. The Nazi salute is slow, formal and serious, they barely move another muscle.