Here is a parallel argument for you. The history of science has been one discovery after another which leaves us with new, increasingly complex unanswered questions about phenomena. It is reasonable to think that if/when we reduce consciousness through science we will find that there are more increasingly complex unanswered metaphysical gaps.
Quantum mechanics does increase the physics reasoning contexts owing to the incompatibility between classical and quantum mechanics. But this is not an in principle divergence in the way that philosophers understand essences. We can describe and reason about quantum mechanics and classical mechanics using the same language and the same descriptive tools, namely mathematics. When it comes to phenomenal consciousness and physical behavior, we cannot reason about them using the same descriptive language. Hence they count as distinct categorical essences until we discover the bridging principles that reduce consciousness to physical behavior.
This has to be one of the most dumbfounding pseudo-philosophical sentences I've ever read. Metaphysics by definition is unfalsifiable and unscientific; it exists on a parallel plane from empiricism and is derived only through intuition, reason, and for the religious revelation. If this guy's claim for material consciousness simply rests on an intuitive argument from induction, it suffices as a counter argument to say "If I am mistaken, I am".