The market will correct before mid-terms next year. This is almost a certainty. By how much and when exactly - now, that's where the shorting profits are. PS. Burry infamously made several more bets after the "big short", bets that misfired. That is, his record is far from being 100% right.
What makes it an (almost) certainty?
To put another way, there's a lot of "potential energy" being built up in the markets right now. That doesn't necessarily mean they'll pop like a bubble - but there's really no precedent for them to continue rising.