I do like the logic of that! It’s better than Rey just happening to flip through that page the day they find out about Exegol.
As of now though, I think we’re changing that page to set up Force healing, since it plays a bit of a role in the movie too and is never really addressed. We can assume she had just scene that read about it before this day. Though your idea would still benefit from her seeing it in a vision for the other reasons you mentioned.