WARN Act just means you have to give people notice. You can revoke their credentials and tell them to stay home while the 60-day clock runs. You just have to keep paying them for that time.

And presumably their stock also vests?

The WARN act only means you need to give 60 days notice in certain types of mass layoffs. Given that Twitter hasnt done any mass layoffs yet, speculating on whether or not they gave enough notice under the act is a bit premature.

Twitter hasn't, but it seems that there is some internal tension around it. Making working conditions worse to force people to quit, setting impossible deadlines to fire en masse "with cause," and just generally shedding employees but not calling it a layoff all seem to be in play.

Elon is interacting and trying to dodge this act. He seems to want to cut Twitter's workforce at a scale that the WARN act covers.