Musk is practically stuck in a 13yo's mindset. The golden spoon has been sticking out of his arse since birth, but of course momma and poppa will make little Elmo believe he's a genius because he has... gasp... ideas.
So they push a shitton of money into his education and ideas, and of course he gets stuck in the typical preteen daydreaming phase of being a genius billionaire who can never be wrong. The money allows him to surround himself with people who actually KNOW how to deal with stuff - including making sure he can't screw things up. And that's how the whole Musk Management department of SpaceX was practically born.
But now Twitter is a different story, all his safety nets are gone, and it's all on him. Of course he fumbles it big time.
Simply said, yes, he's an absolute moron. With more money than common sense or logic or talent or knowledge or... Okay this list could go on for a while, I think it's best to stop here.