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Yes, but you could still be making an observation from outside our universe, to a degree of certainty that convinces you, and you might be able to use the new theory to make falsifiable predictions. I'm just arguing that we might learn the properties of something from beyond our own spacetime. It's not ruled out, and it seems likely to me that something like that will happen.
It's too bad that Dark flow was debunked, that would have really stirred the pot and been a huge paradigm shift for a lot of people.