I mean, is this really about ai? Or is this just standard digital effects stuff? It feels like AI is getting thrown around everywhere just because it's the hot buzzword that will get clicks.
I mean, they scan someone's body, then just map it onto a 3d model that has been motion captured from another extra. No "ai" really needs to be involved there.
Of course, from the actor's perspective, there is no difference, they still don't get any follow up work.