First round got 3 months because a no-notice mass layoff requires at least 60 days according to various state and federal WARN acts. Once you get down to actually firing people for cause, you can (usually) skirt WARN acts.
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.
If it’s “for cause,” then is any severance at all warranted?