[Retric]

This is one of the major reasons I said time travel without information transfer is not interesting. Even if it actually happens, it's not distinguishable from something else.

PS: Quantum entanglement is also less interesting than you might think for similar reasons.

[caf]

In the case of entanglement though it is actually distinguishable from other, less "interesting" phenomena though, right? That's what the loophole-free Bell tests are about.