So you guys are apparently discussing an idea of Rey turning to see the children watching a puppet show of Luke’s actions in TLJ; I disagree with this. Why, you may ask?
The point of the scene with the Aki Aki children is to establish the stakes for the movie, to drive home our connection with the galaxy (especially in the context of this film alone) and show what the heroes are really fighting for; reducing it to a payoff of the events of TLJ undermines that.
I don’t see how that would be the case at all. I read the scene as hammering home how Rey grew up orphaned and without a sense of community. She sees a communal experience with children laughing together and is then asked her family name, to which she has to admit she has none.
Star Wars hasn’t really ever cared about tying stakes to anything solid; it’s always been abstract or related to the main characters’ own connections, from Alderaan to Naboo and ever on.
Tying this moment to the Battle of Crait isn’t a payoff, it’s carrying that idea forward. We see how the legend leads to a revival and rise of Skywalker that coincides with Rey taking the name. It is thematically important for this film, building on the previous one, which makes it even more valuable IMHO.