If the universe was fine tuned for our life...

[Heywood]

Wait a minute here. For the existence of sub-realities (as you define them) to have any predictive power for a larger model, like the universe we inhabit, they would have to be a great deal more like the universe, i.e. real. And that's the rub, the space these sub-realities describe is imaginary. They don't actually exist anymore than the reality in a novel exists.

Speculating that we might be part of a simulation like a computer game is fun, but it doesn't add to the likelihood that such is the case. We know of no simulated reality that describes actually created space. Therefore I don't see that sub-realities are of any use in determining how the actual universe came to be.

You miss understand what is being predicted. What is being predicted is this:

Things which satisfy the following definition require intelligence to come into existence.

A sub reality is a space continuum that is governed by rules. The space continuum of a subreality is not the space continuum of its parent reality

The reason this prediction currently holds is because everything that has thus far been presented as satisfying this definition requires intelligence to come into existence. If our reality satisfies this definition then the prediction likely holds for it as well.

Like I keep saying....if you can come up with something that satisfies the definition but doesn't require intelligence to have come into existence...then you demolish my argument. The more times you examine things and find that they satisfies the definition and requires intelligence to come into existence....while never finding a thing that satisfies the definition but does not require intelligence to come into existence, the more likely it becomes that all things which satisfy the definition require intelligence to come into existence. This is the induction.