WARN act requires 60 day notice.
Musk is having them to continue to receive salary and benefits until Feb 7, three months from now. The wording of the notice is that their employment will cease on Feb 7. They just are no longer allowed access to Twitter facilities or computers.
If she's 6 months pregnant, she will be covered until her due date, and she has the right to buy coverage from Twitter under COBRA.
Correct, so in effect Musk is giving them 90 days notice.