Why would Rey even know about Anakin’s bedside conversion? I can’t imagine that any rebel worth their salt would be impressed by the notion that Darth Vader’s soul was saved at the last minute. How did this so-called legend spread? And why?
It would’ve been so much better if Rey had simply said “you defeated the Emperor at the battle of Endor!” and Luke had responded with “well, it was a little more complicated than that”. Having the whole Vader/Anakin story become legend makes no sense to me.