I don't think he was implying that we're the only life around. Just that, out of every planet in our particular solar system, only one in nine has optimal conditions to sustain a complex and varied life ecosystem, if any life at all. And this is most likely the case in other solar systems that might theoretically have an earth-like planet with life, as well. Plus out of those, there's probably quite a few where the "Earth" planet's orbit is off by a couple hundred miles, or lacking a properly-formed atmosphere, and causes that too (and therefore the entire system) to be bereft of life. So the odds are much more against than for any given body in the universe to support life, all in all.

