In Europe, it's obvious to everyone that he actually did, and deliberately.
He can't ignore the meaning of this.
It's not even a discussion for us. That is fact, you or the ADL (I don't care who they are) can say anything they want, the fact that he did it and can't ignore the meaning of this make him a Nazi. Adding to the context of supporting Neo-nazi political groups and the ideas that he is pushing, there is absolutely zero doubt why he made a nazi salute.
It’s obvious to anyone who has watched the video with an iota of common sense that Musk didn’t deliberately make a Nazi salute.
Even the hypersensitive ADL can recognise that.