I'm not OP but I think that they said that Elon sounds like a bad PM to work under, not that he's unsuccessful at developing and marketing products
He's a pretty crazy guy, but I can think of few people/companies who are doing things that could have as big of an impact as Tesla, Starlink, and SpaceX.
I understand how you could have doubts with Tesla, but that how could those feelings not dissolve when seeing those reusable boosters land on their own? How many other organizations could do such a thing?
I know that Tesla has a lot of negative press due to autopilot (and rightly so), but they are still a leader in both self-driving and electric vehicles.
There's also a lot of potential (depending on who you ask) for autopilot, although I think it was a mistake to switch from lidar to pure computer vision. Time will tell.