Ian Holm CGI in Romulus

Has anyone else watched the newest home release of Alien Romulus to assess the apparent 'new' CG work on Ian Holm's Ash/Rook? I've just seen some HD excerpts and i'm struggling to see much of a difference, all it looks like is they darkened it slightly to better blend with the room but the animation and mouth movements still look janky.

Also wouldnt it have been better to have 'Rook' played by Michael Fassbender to better sync with the previous 2 films and better continuity to explain the black goo element? As it stood when Romulus was first release many people were confused, as were some reviewers, that it wasnt Ash and that ship wasnt the Nostromo as they both looked the same from the first Alien movie, why have Ian Holm (RIP) play the synthetic in a very Nostromo-looking craft if theyre just going to call them different names? It just looks like part of the fan-service and to include Holm because he was in the first movie and a well-liked actor since.