Is the same true of Tesla? I know of plenty of people who work or would like to work for Tesla. Another group of companies that haven't received as much attention in the recent "SF exodus" narrative are Google and FB. Google has been opening large offices outside of SF for years and is slowly contributing to the growing of tech hubs around the country. Google's Boulder office comes to mind as a good example.
I'm not aware of any large FB spokes, but FB remote work allowance might end up having a similar effect. Not to mention the many startups that have realized that the distributed model works fairly well if you know how to do it, and opens up a large talent pool. I currently work for such a startup and we don't plan on going to back to a central SF office model post pandemic.