Twitter's only argument could be that this wasn't a mass layoff assuming the numbers check out, IIRC less than 50 employees at a work location (whatever that means with all remote work). Musk bought the company about 30 days ago, so it couldn't have given a60-day notice since. And I doubt that these employees were laid off "for cause", otherwise all layoffs would be for “not satisfactory” and avoid severance. Of course you're screwed if you're here on a visa that doesn't let you fight this.