Oh that’s been done ages ago:
No, that’s just a deepfake on the Disney CGI mask. The facial movements are off - you can see it in the eyes. It’s not the fault of Shamook - who is brilliant, it is due to the CGI mask of Tarkin on the actor’s face. It still has the uncanny valley effect.
With AI, you could replace the original CGI “Tarkin Mask” with one with better eye movements and facial details, and then add a deepfake on top of that - then you would get a pretty lifelike result.