He did something that people who fetishize the downfall of their enemy desperately want to be Nazi salute, so they call it that, but it was not a nazi salute.
If it was he would have said so, since at that point you are basically showing the world you are a nazi. But that is not what happened.
People really don't take their credibility seriously, and will cry wolf at anything that moves, seriously undermining any argument they make.
There are ample ways to hate on Elon using factually true things he has done. Sticking to those makes your arguments rock solid, and keeps your credibility high. So much is wasted by idiots slinging smoke because it makes themselves feel right.