No, you're not seeing stuff, Alien: Romulus' Ian Holm CGI does look different in the home version, but it's still a moral (and visual) nightmare
One of the biggest criticisms that Alien: Romulus faced upon its release was that Ian Holm's CGI was terrible, but that seems to have been tweaked for the home version. I'm really not a fan of the trend over the past decade of including actors in sequels to classic movies through the use of CGI ...