I just watched it.
That was easy to watch. If that happened to me, I'd be out of it fast - as Rob said.
As a matter of fact...I might try that with 185 or 225 or something, just to see how quickly I can get out of it.
What was strange to me was how much life he had left in him, yet didn't seem to do anything at all to get himself out?

I admittedly do use clips while benching alone, but truly on weight I am 100% certain I could get out of.
Maybe max 265.
On 275+, working out alone, I'd ditch the clips.
If I know I can do something for 10-20+ reps, clips help stabilize the plates / keep them in position.
I only got 250x6 here [I had 7+ in me, but didn't want to do that, being alone], but I'm doing each rep in contest form here - so no risk to me:
https://www.instagram.com/reel/CxuEwWut2AE/I would never do a max alone with no clips. But it seems like that goes without saying for everyone here.