I know it wouldn’t be possible for only his prequel memories to be restored because in the later scene he recognizes Luke’s X-wing and realizes that doesn’t make much sense. So if we were to include his prequel memories getting restored it would have to be along with everything else. I suppose that also begs the question of why R2 didn’t give him those memories sooner over the past 50 years.
I suppose. I know that someone did a mockup of having Threepio mention Anakin or Padmé
If you remember at the end of Revenge of the Sith/Labyrinth of Evil, Bail Organa tells his commanding officer to wipe the protocol droids memory, they never mention R2 restoring C3PO’s memory until The Rise of Skywalker.