@rihardjarc I think he ended his elaborated discussions in the letters on the shorts rather than anything else. The short squeezes a couple of years ago might have played a part as well. I am not so sure about the SEC filings.
@kostofff the short squeeze drama probably did play a role. I think it changed the view on shorting in many people. Now for shorting it's not enough to be smart you also have to be low key.