The problem, however, is you’re effectively defining consciousness in a way that human brains do not follow unless you make appeals to some supernatural process beyond the reach of science (ie fundamentally subjective, unquantifiable).
So again, it’s a bulls*** definition of sentience.
I don't know what you mean by it being a BS definition of sentience. It's a technical term invented by philosophers to mean a specific thing. If you don't like it, use a different word.
Note: you brought up the term qualia, not me. I have never actually liked that term. I prefer the terms "consciousness" and "conscious experience".
If science is unable to account for the existence of such experiences, then either they fall outside of science (so what? who said empirical science was the only means of knowing? the claim itself isn't scientific) or science must be revised. And what of the claim that anything that isn't quantifiable is bullshit? Is that quantifiable? No? So it's bullshit?