As with all such articles, there is no real help with getting through the hurdle. Very surface-level, sounding like AI summary at times.
Also, AFAICT, nobody has yet actually worked out spacetime with masses properly, right? Where masses influence and are influenced by space, each other and time, all at the same "time", in general?
Edit: Looks like people are working on it? (for mergers of binary stars) https://arxiv.org/abs/2405.06035