I’d say that the whole “turn your brain off” kind of has to be applied to a lot of sci-fi and especially fantasy (and SW is obviously both), otherwise you wouldn’t have much of a story at all. As long as it’s balanced, and the whole narrative itself makes sense, then I think it’s ok to stretch your suspension of disbelief or bend the rules a little. I mean ESB, though generally considered the best SW films, really is the most nonsensical one of them all. The continuity of that film is a complete mess if you try to make sense of it (at face value anyway), and some scenes breaks physics even by SW standards. But, it all makes sense as a dramatic narrative and that’s what makes it a good film and justifies all the weird logic IMO.
You don’t have to turn your brain off to suspend belief.
Something can be fantastical & even silly while still making sense within it’s own context.
This is a very different topic though.
So anyway, yeah, never noticed that Luke claims Vader is on the moon before he arrives.
Neat bit of trivia & a welcome contender for a Revisited change.