There are articles from "real institutions" saying it is him, for example: https://www.bloomberg.com/news/articles/2020-04-07/michael-burry-slams-virus-lockdown

There are articles from "real institutions" saying it is him, for example: https://www.bloomberg.com/news/articles/2020-04-07/michael-burry-slams-virus-lockdowns-in-controversial-tweetstorm https://www.bloomberg.com/news/articles/2020-04-07/michael-b.... It wouldn't surprise me that it is him, he seems like a contrarian in nature (if the movie did his personality any justice) and what he's been saying this year is pretty in line with that.