We should not be surprised that the environment we find ourselves in is so seemingly well-suited to the flourishing of life. I believe the grandparent post was saying this as a response to the idea that things are too improbably perfectly-suited for us. Far from being a non-sequitur, it is almost stating a tautology. The environment we find ourselves in is the one that has given rise to us, with our ability to think about these things.

I'm sure there is a Douglas Adams passage that illustrates this but I can't remember it.