No he's not by definition. He isn't Ukrainian so he can't commit treason against the Ukrainian people. He didn't commit any treasonous acts against the US or our allies here either (Ukraine is not an US ally last I checked).

I despise Musk and pretty much everything he stands for. I think it's borderline societal insanity to allow private industry to put satellites in space and think it takes a certain kind of awful megalomaniac to think they can control that infrastructure single handedly. But saying he's treasonous for this? That cheapens the word when you use it against people that ARE treasonous. For instance when certain ex-Presidents decide to steal classified documents despite numerous warnings...