Saw a video about this on Mastodon. It looks like they projected a whole video presentation that outlines a bunch of the Nazi shit Musk has done, not just the image of his salute.
This is fake though. The letters don't match and there is no other pic on the Internet to prove, it happened. But the fact it seems real, speaks volumes :D
Edit: Turns out not fake. I was just skeptical at first.
Tesla, skinny and in nerd heaven getting to be part of nerd ghost orgies where he would do it with 5 or 10 of the most beautiful, clever and knowledgeable nerd babes...play nerd beard games...he probably saw Elon, like all of us did back in the early 2000's, and said " hmmm what a wonderful guy, I'm so proud of what he's accomplishing in my name! But now, after countless rolls in his grave, he's just taking it one day at a time. During the last orgy...Tessy! Touch my beautiful round and curvy monopoly figures please!... Hold on, Elon just did a Nazi salute!...oh my God!... Tesla, you called? Yeah, did you see what Elon did again? Yeah another Nazi salute! I just called hell and they are sharpening the glass ping-pong balls... Oh those? No, they don't play ping pong, those go up his butt where they break. It's a first day thing..... He's due there when he turns 93. Yeah we're going with a pretzel. Its funny as heck, that's why!