Elon Musk says SpaceX HQ officially moving to Texas, blames new CA trans student privacy law

Disney did something similar recently and fucked over some of their employees because they eventually decided against it. Might be able to find your answer there.

I hope the many workers that can't move get some compensation, and I also hope this sets back spacex years because of lost knowledge.

Severance is not required by law. So no, it doesn’t grant them severance.