There's one guy that did a fairly convincing recreation with a squib, but idk if I believe that. There were some other guys that did analysis of the time between cracks, and found it didn't match the shooter being where the shooter officially was.

I think the biggest thing is the timeline of rifle disassembly and reassembly doesn't line up at all, especially considering the disassembled rifle wouldn't be able to fit in the backpack that was in the video. There was some gun guy that bought the exact rifle, and the exact backpack, and the official story clearly doesn't line up there.

But ultimately I don't think it's a huge deal what really happened. It's created a decent amount of conflict among conservatives, what with Candace Ownes, most people don't care anymore, he probably did actually die, and exposing Kirk as alive probably wouldn't change much tbh.