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There was no reference to the original paper in the link you provided, so I am a bit cautious about commenting.

If their theory is just an explanation without any predictions, then it is useless. It won’t be any better than the current ‘trick’ that we are using now, i.e. adding the observation patch to quantum mechanical formalism. If they can propose an experiment that will allow to discriminate between ‘the universes’ or an experiment that can’t be explained by the current formalism, then it could lead to a revolution.

In general I am skeptical, when mathematicians propose physical theories.