If the indication is true that Twitter is carrying a lot of deadweight, then Elon's purge is going to make Twitter a very lean and profitable tech company, not unlike Netflix.
If I was working at Twitter and Elon strolled in and said "Ship this (non-emergency fix) in one week or you're fired", I'd tender my resignation immediately. First, it's ridiculous. Second, we already know he wants to get rid of 1/3 to 2/3rds of the company, so there's no guarantee if you pull 80-hr weeks, weekend all-nighters, that you won't get fired anyway. And honestly, a CEO expecting people to regularly pull crazy hours like that is a red flag.