I think it's a good theory.

[It's fine, everyone knows that, he has to say it though.]

You think their memories of this place are on a disc or something, somewhere? In the cloud?

[He's not saying this is impossible, that would have to be part and parcel of simulation theory, but it makes him wonder about the more unpleasant existential questions, like again: how long have they really been here, all of them? Hmm.]

Maybe we don't even have real bodies anymore.