Now, a new thought experiment is confronting these assumptions head-on and shaking the foundations of quantum physics.This is interesting, but it does not affect any predictions of quantum mechanics. It only involves what one observer thinks that another observer is seeing.
Deutsch thinks the thought experiment will continue to support many-worlds. “My take is likely to be that it kills wave-function-collapse or single-universe versions of quantum theory, but they were already stone dead,” he said. “I’m not sure what purpose it serves to attack them again with bigger weapons.”He is a die-hard supporter of the many-worlds interpretation. He apparently thinks that other interpretations have been shown to be "stone dead".
It is a little crazy to think that some stupid thought experiment is convincing about the existence of non-observable parallel universes.