Premise B is where you lost me.
The premise of philosophical zombies is that it's possible for there to be beings with the same information processing capabilities as us without experience. That is, given the same tools and platforms, they would be having just as intricate discussions about the nature of experience and sentience. without having experience or sentience.
I'm not convinced it's functionally possible to behave the way we behave when talking & describing sentience without being sentient. I think a being that is functionally identical to me except that it lacks experience wouldn't be functionally identical to me, because I wouldn't be interested in sentience if I didn't have it.