Thousands of employees build it. In the case of SpaceX and Tesla, they frequently build it in spite of Musk, dedicating time and effort to preventing him from screwing things up when he breezes in.
https://www.reddit.com/r/SpaceXLounge/comments/k1e0ta/eviden...
https://youtu.be/t705r8ICkRw?t=378
This lie seems mostly accepted only by non-technical people in technical fields from what I've found out. Leads me to believe Elon actually is one of those great people that will be more appreciated after his passing.
It's like they have a personal investment in Elon not having done the things that Elon has very clearly actually done.
https://www.theregister.com/2022/11/14/musk_twitter_rpc_spat...