In the video link that komponisto gave, the relevant section of the video starts at 49:00 or so. He doesn’t argue there though that consciousness—he uses the term sentience—will necessarily remain a mystery but only that this might turn out to be the case. He makes the analogy of trying to think about time before the big bang and that there is some kind of conceptual category-type error going on there that gives it its subjective feeling of being mysterious and unknowable, and states that this may be the case with sentience/consciousness, free-will, etc.
In the video link that komponisto gave, the relevant section of the video starts at 49:00 or so. He doesn’t argue there though that consciousness—he uses the term sentience—will necessarily remain a mystery but only that this might turn out to be the case. He makes the analogy of trying to think about time before the big bang and that there is some kind of conceptual category-type error going on there that gives it its subjective feeling of being mysterious and unknowable, and states that this may be the case with sentience/consciousness, free-will, etc.