Genius Logic, right there.
"If we can never find a[n Earth] microbe that can grow under conditions on another planet, then it starts implying that life may not exist on that other location," he said.
Yeah I saw that as well. Rather idiotic conclusion that.
Ok. Maybe I'm missing something (I haven't see the context surrounding it), but why is that an idiotic conclusion? If we can't get any earth microbes to survive in the conditions on another planet, then it does strongly suggest those conditions aren't conducive to life (at least as we know it). Unless you were being sarcastic (like "genius logic" meaning it's so obvious it didn't need to be said)? Like I said, I don't know the context, so maybe I'm missing something.