We don't think it has exactly the probability of 0, do we? Or that it's totally impossible that the universe is infinite, or that it's truly non discrete, and so on.

A lot of conceptually simple things have no exact representation on a Turing machine, and unduly complicated approximate representations.

edit: also it strikes me as dumb that the Turing machine has an infinite tape, yet it is not possible to make an infinite universe on it with finite amount of code.

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