R2D2 transmite a história para os Whills, então não pode ter sua memória limpa.
Em Os roteiros anotados para a trilogia original George Lucas diz
Originally, I was trying to have the story be told by somebody else (an immortal being known as a Whill); there was somebody watching this whole story and recording it, somebody probably wiser than the mortal players in the actual events. I eventually dropped this idea, and the concepts behind the Whills turned into the Force. But the Whills became part of this massive amount of notes, quotes, background information that I used for the scripts; the stories were actually taken from the Journal of the Whills."
Então, parece que a ideia era de que o Whills foi esquecido.
No entanto, em A Revolta dos Sith em Making of Star Wars , parece que a ideia foi ressurgida, pois
The events surrounding the life of several members of the Skywalker family were recorded in the Journal by a Keeper of the Whills, after an interview with the Astromech droid R2-D2 one hundred years after the Battle of Endor.
Eu não possuo nenhum livro, então estou apenas relatando o que está em wookiepedia, mas você pode achar que há mais detalhes em A Revolta dos Sith em Making of Star Wars .