In the original film I’d agree with you that there’s no chance she’d take up Palpatine’s offer because Luke brings prophecy into the whole thing. He spoils everything about the ending in the original dialogue by saying Ben would die and that Rey is destined to finish Leia’s Jedi path.

Ascendant’s new Luke dialogue doesn’t guarantee any of that. Sure, it’s a massive boost of reassurance, but it doesn’t directly dispute her vision of herself on the throne of the Sith. So Palpatine’s scheming doesn’t hit as hard as it could, sure, but at least it’s hitting to a certain degree, now. But I do agree that Luke and Ben needed a scene or two together in this film. The easiest place to do that is the one I’ve already gone over in my thread with dialogue taken from the DOTF script. It replaces a useless exchange between him and Palps telling him to kill Rey for the third time. The only other place to insert a Luke line to him would be when he appears to hear somebody nearby (he looks up suddenly and searches with his eyes) on Exegol when holding a dead Rey.