it seem to me that einstein referred to some "magical structure" that remain even in a vacuum.
Gravitational waves are waves in this geometrical structure. If it was flat, there would be no gravitational waves. And the gravitational waves produced by black hole mergers are unimaginably powerful. In the largest ones, the power is briefly more than 50 times the output of every star in the observable Universe.

It fails in that it is never possible for any amount of local information to make the results of experiments predictable. As the only solution is for the information to break causality, quantum mechanics is not deterministic (when causality is broken there is no real meaning to determinism, as information does not respect the order of time).