I suspect all these narrative-followers actually realise Musk isn't a nazi but they just consider him to be someone who needs to be dealt with and as such are fine with throwing everything at the wall to see what sticks.
so all these social justice warriors pick the easiest target and point to some tweet/image and say "Nazi!" thinking they've done some great servitude to humanity and can now feel great about themselves.
kind of like using paper straws and patting yourself in the back