But this study does not do that. What we know is that life on this planet evolved to the conditions of this planet. As the conditions of the planet changed, which they have and quite radically, so too did the life.

Life didn't evolve to breathe nitrogen, oxygen, etc which we just coincidentally had - it evolved to breathe and utilize what was already present on our planet. And this should be the assumption for all life, which means that restricting stuff because it would be inhospitable to us is completely nonsensical.

And if what you know is nothing, you accept that, rather than speculate based on arbitrary assumptions.

We're not looking for all life. We're looking for any life.