Do you have a link? I used to think a lot of that was just conspiracy theories, but I’ve seen more and more mentions of this at places I trust that I’m ready to investigate some of the claims instead of just ignoring them.
There are like hundreds of varied sources concerning 9/11 and associated conspiracy theories. And while most are just out there, like way out there, some are thought provoking. Richard Dolan Youtube talks of some, Fade to Black, etc., etc., etc., etc.