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Re:Quantquake: 2020 and the Revenge Against the Nerds by Armisael16 on Friday January 29, 2021 @08:12AM (#25956883)
I think you may need to reread the tweet. He isn’t saying they shorted during the drop; he’s saying they shorted just before they initiated the drop.

It’s obviously profitable to short a stock when you know the value is going to tank in half an hour.

Re:Quantquake: 2020 and the Revenge Against the Nerds by hntrader on Friday January 29, 2021 @08:15AM (#25956912)
The tweet is fine and I'm sure many hedge funds and prop firms shorted the initial catalyst. What I'm referring to is the "short ladder" hypothesis mentioned in the parent post which was originally spread on WSB that Justin didn't refer to in the tweet.