So, what he said was "There is no proof". That could be interpretted as 'no', but he didn't outright say it. Instead, he went on about other things. I feel that he lost an opportunity for a very knowledgeable approach to if there 'could' be life out there.
Consider the drake equation. A scientist came up with this. Also consider the age of the human, versus the age of the universe. We are only a spec on that time line. Given the idea that if we ever had the ability to traverse space, would we interfere or make ourselves known to other worlds? No, of course not. Now, do you think that, again, given that we only invented the transistor only 60 years ago, do you think the we are able to technologically 'find' these aliens in space, let alone our own solar system? With transistors? The answer is that we are very, very, very young in our science and have a lot to learn.
We, as humans, have this idea that we are all smart. But, we are actually very dumb compared to what we are able to learn given time. Consider if we were 2 million years more advance to what we are today. We, as humans, are tadpoles in a pond on a planet, compared to other species in other worlds. Heck, we use 'RF' energy to communicate. That could easily be see as a form of basic vocal grunts, or, the equivalence of 'scratching in the dirt' (as cows and horses do), given their intelligence.
Perhaps he didn't downright avoid the question, but, he could have expanded a little bit and used his 'ability' to wow us with the possibility of it existing.