Actually, I think Palpatine knowing about the dyad survived well into the post-production process: the Reddit leaks that came from post-production workers described Palpatine’s plan being to drain Rey and Kylo’s energy, even claiming that Palpatine talked about the dyad during his first scene.

In general, the plot leaks before release sound a lot better than the movie itself: it feels less rushed, more developed, and generally more satisfying. Unfortunately, unless they eventually release the deleted scenes, it will be impossible to make the movie feel like it did before it was mangled in editing.