I wish to reiterate that in the original post what I am talking about is schizotypy, not psychosis. These are distinct conditions and should not be conflated.
Additionally, in that comment, I mention that I have a handful of friends who have experienced psychosis. None of these people were rationalists or had anything to do with rationality.
I agree that it’s unlikely we could ever be 100% confident in some proposition here. But, with sufficiently high fidelity neurostimulation protocols (likely invasive ones) coupled with direct reports, I remain optimistic we could develop something like asymptotic confidence in a given theory of consciousness.
I doubt we could ever keep the armchair philosophers happy. But for the consciousness engineers (i.e. the people who actually want to do something with a theory of consciousness), I think this should suffice.