I mean yeah, but he did it more than once, and it wasn't like it was an odd sort of wave, it was a full on parade standard Hitlergruß (thumpy on the chest hand out at the ascribed hitler angle). Which he then repeated to the audience in the front and the people behind him.

Monty python use to do it all the time, as did a number of other comedies. but the important distinction is that comedians aren't in power.

Musk arguably has more power than the president. So him thinking that it can't harm to try the old nazi salute, with unprecedented power isn't a healthy thing for democracy, regardless of who you think should be in power. Do you think he's going to give up that power willingly?