Yeah but that's still considering the epiphenomenon hypothesis and not other possibilities. What if the only thing you can explain with the epiphenomenon idea is the Philosophical Zombie (mind) but you still didn't explained a bit about consciousness.
My intent was actually not to take any firm position on the nature of consciousness but rather to present one possible model, that I think many would find plausible, as a counterexample to the progressive replacement argument (ie. the argument that a machine can be conscious because you can gradually turn a human brain into a machine).
Ref: https://www.youtube.com/watch?v=NK1Yo6VbRoo