I haven't been a fan of his since he called the cave divers pedophiles for not using his stupid submarine, but I at least thought he actually did stuff.
But with the recent case where he bragged about being in the top 20 Diablo players in the world, only to find out that he paid people to level his character up for him, makes me think that maybe he doesn't actually do anything. I mean, he's bragging and lying about something that does not matter.
No one really cares if the CEO of your spaceship or car company or brain-implant company is good at video games. If it turned out that everyone saw he was bad at Diablo, approximately nothing changes (and potentially people like him even more if he's a good sport about it and laughs it off!), and yet he felt it was important to construct a lie around this so he could brag.
If he's going to brag about a completely insignificant false accomplishment, why should I assume that he's going to tell the truth for stuff that people would actually care about? At this point, I'm erring on the side of "Musk doesn't do anything outside of providing initial funding".
Maybe I'm wrong, that's certainly possible, but he really killed a lot of his credibility.