I really don't like Elon musk and I am convinced that he cares little about anyone but himself. He is a liar and a fraud. His Morals are clearly 100% motivated by profit. He seems sexist and classist.
Trump is obviously classist and seemingly racist (the difference between racist and classist isn't always so obvious)
I really really don't like both of them.
But I don't think Elon did a salute. To me, (especially as he did it twice) it seems like he moves his hand to his heart and then "throws" it out to the audience. Would be on brand for Zuckerberg, very alien. But "innocent". I guess, you could argue that it is a dog whistle and he wants deniability.
Honestly, It doesn't matter to me. A bad man is a bad man.