Good news: Musk has done none of those things. At best he's distracted and interfered with people who did those things.
They already design new rockets, robots and chip without him being on site because he's busy with Twitter.
And I guess it's pretty easy for him to do a remote session if he needs to. He has his own Internet company.
Otherwise it's like driving a combustion car if you own a electric car company.
Doesn't mean he designed a rocket, robot or chip.
Ever heard of web meetings or even telephone?