Right. Yeah the people claiming law breaking seems to come from a few (5) employees who started a lawsuit on the day of (may even be a coincidence). NYT and others blindly parroted the info that a suit as been filed (of course, in NYT's language, it's like: "laid off employees sue Twitter for breaking employment law!")
The only claim someone might have is if they individually fully terminated in the past ~30 days. Then there is question about whether they were "part of" the layoff or not and therefor required more days of payroll / benefits.
This is why in a medium+ company, if you are fired even individually, they often pay the 60 days salary + benefits, with any severance on top. It leaves them the option of being able to fire other people in the same time period without exposing them to a BS lawsuit where the plaintiff/s may claim they were part of a layoff and weren't given 60 days.
I'm not trying to imply they are not giving notice, but if they don't give 60 days, they are breaking the law.