He did not do a Nazi salute. I honestly have no idea who the people are pushing he did do a nazi salute (oh wait, I do, it's the same people that call Trump a fascist every time he flexes his fingers) What he was doing was obvious, it was a gesture of "my heart goes out to you", to both sides of the audience, which is what he said right after doing those two gestures. You can say that he shouldn't have done it because it looks a bit too close to the salute, which fine you have a case for, but going all the way to fully accuse him of doing it completely ignoring the obvious context in which it was actually done is a bridge way too far for me and I'm honestly surprised there are people even here that actually accuse him of it.
I don't like Elon at all, I wish he'd just stop running his mouth and stop ruining Twitter like a lot of people, but there doesn't need to be obvious fake accusations thrown around to pick at him.