The Hepburn Imp was a bit of both lookalike and CGI, as was the travesty of a treatment of Sean Young - shrunken weird looking CGI facial features shoehorned lost in a face too big in Bladerunner 2049. Deepfakes look far more human.
It really does beat 3d recreations like that awful scampering dead-eyed implike fake Hepburn in that Galaxy ad. Quite astonishing quality compared to a few months ago, imagine being able to recast any movie or TV feature on the fly; voice emulation technology is already there.