i know this is necroposting but i have to clarify.
one of the major premises of the p-zombie thought experiment is that there is nothing about information processing (AS WE CURRENTLY UNDERSTAND IT***) that entails or necessitates subjectivity. Information processing has zero explanatory ability for subjectivity. You cannot just assume that 'subjectivity is information processing' without proving it somehow, that's not how science or philosophy work. Making a positive claim like 'information theory can account for and explain subjectivity' requires proof. and since no proof has been provided we must assume the negative claim, that subjectivity is not explained by information processing theory. If subjectivity is information processing (the way we currently understand information processing), prove it! Show your work. If you think information theory only needs trivial modifications to account for subjectivity it should be easy to elucidate what kinds of modifications those could be and what kinds of experiments we can conduct to test those modifications.
***For if information processing theory requires substantial revision to account for subjectivity, which i think is at least plausible if not obviously true at this point in history, then the claim that 'subjectivity is information processing' becomes vague and meaningless - we do not know what this hypothetical revised information theory looks like, what it claims and assumes as logical axioms or empirical truths, so making any statements about this hypothetical future information processing theory is completely pointless and meaningless.