I don't really think thats true.

The deal with tesla is that there is a relatively small employer pool, so you can be fairly bad employer but still get good outcomes. The same with spaceX. Sure early tesla had some stories about it being fun, but there was/is a darkside.

The issue with xAI is that researchers have a whole bunch of other employers to choose from. Even at meta, where it used to be fairly nice for researchers, the pressure of "delivering" every 6 months lead to bad outcomes. Having someone single you out for what ever reason the boss had a bad day, is not how good research gets done.

We have seen (A few of my friends were at twitter when it was taken over) that Musk has a somewhat unusual approach to managing staff (ie camping at work). Some researcher love that, assuming that they have peace to research, and are listened to. But a lot don't.

I think we are saying the same thing. He builds trillion dollar companies that are labor efficient; nobody said they are good places to work.