The logic of the previous Q & A does not, actually, prove or even suggest that there really are multiple universes. We might just have got lucky in the only universe there ever was and ever will be.

But sure as eggs, if that one universe had been inimicable to life, we wouldn't be here to discuss it.

Unfortunately, this question is effectively a religious one. "Do you beleive we are alone and lucky (or guided), or are we a statistically unimportant sample from a wide range of possible outcomes (the way the mediocrity principle ought to be applied but is NOT by the careful and almost improper phraseology of the authors).

Right now, there is no way to answer what should be phrased as a Meta-question.