Does he define "conscious"?
No. Elsewhere he has said "I believe that consciousness is the way information feels when being processed", but in this talk he seems to make a little bit of a retreat. He describes a positive singularity with p-zombie AI/robots that have perception and appear conscious, but aren't "aware" of the world around them. He makes no clarification of how perception differs from awareness and doesn't mention introspection at all.
Max Tegmark, from the Massachusetts Institute of Technology and the Foundational Questions Institute (FQXi), presents a cosmic perspective on the future of life, covering our increasing scientific knowledge, the cosmic background radiation, the ultimate fate of the universe, and what we need to do to ensure the human race's survival and flourishing in the short and long term. He's strongly into the importance of xrisk reduction.