I don't know whether I think it's free speech honestly, but I think the more relevant question here is whether Musk would consider it "free speech" to post the same type of information about someone else.

When he's not the object of the speech in question, he seems to think that things like calling people pedophiles is free speech, so he generally seems to be a free speech maximalist and I'm guessing the answer might be yes.

I don't consider a lot of things to be free speech that musk apparently does, but there's a big difference between him being a free speech maximalist in general and just supporting free speech when it's convenient.