When I worked at PayPal I didn't see any code written by him n the code repository. It was all done by a co-founder, a guy named Max, who invented front end language called MaxCode (which was pretty awful, but at least he tried).
As I understand it, the man who conquered the engineering issues at Tesla was Peter Rawlinson when he worked on the Tesla S.
He is now CEO of a company called Lucid, which makes a competitor.
https://en.wikipedia.org/wiki/Peter_Rawlinson_(engineer)
Like Trump would, Musk regularly bashes Lucid and Rawlinson.
Musk takes the credit for other people's work, and in that respect, he's very good at what he does.
Your article is spot on. I haven't been on Twitter for a long time, but for the reasons you mentioned, I know I won't be until he's gone.
His personality type is very Trumpian. Rather fitting for 21st century late stage capitalism.