I think CGI in a scene of costumes and puppets would have stuck out like a sore thumb, whether it was 80s special effects or 2000s special effects. Also it seems like the lightman would have guided 3P0 and R2 down the hallway for some reason, in a deleted or alternate scene. Not much room to add that in - I’ve a feeling if George had done that, it would have become another widely hated special edition change.
“Remember, the Force will be with you. Always.”