ITT: People thinking they have better decision making skills than the richest man on Earth.
It doesn't take being wealthy to understand what stupid business decisions are. That aside everyone who is honest knows that other people's decisions are responsible for his wealth. Every idea he has had for Twitter has reduced it's revenue.
You could have made the argument that Musk's success is due to other people if he had only had one such success. But the fact is that he struck gold with both Tesla and SpaceX and both happen to be in industries with incredibly high barriers to entry (automobile and Space respectively). He really is good at what he does, if awkward.
The post you're replying to pointed out that he's run Twitter into the ground, to which you have no response. I could point this out again and get a bunch of recommends on my post, but I'll respond to what you want to talk about.
Elon Musk has two relevant skills. His first skill is that in situations where the government wants to create a private market where none currently exists and is willing to pay subsidies to do so, he is willing and able to take those subsidies. This is the scenario with SpaceX (the result of government efforts to create a private market for space travel) and the scenario with Tesla (the result of government efforts to create a private market for electric vehicles). He has no business successes that do not follow this model. Obviously Twitter does not have a business model that allows it to rely on government tax rebates, so his being "good at what he does" has no relevance here.
His second skill is that he is as good as anyone in the world at self-promotion. This is why you think that he is a genius.