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.
But my point is that they can already replace the actor today without any ai tech. I mean that's basically how video games work that use actor's likeness (such as sports games). They take someone in and scan them, then they can make them do whatever they want without needing the actual person to act out all of the individual actions.