You can tie a metaphysical issue to everything by asking if it "really" exists, or is it something else that is absolutely not distinguishable from the "real" t

You can tie a metaphysical issue to everything by asking if it "really" exists, or is it something else that is absolutely not distinguishable from the "real" thing. If by hard problem of consciousness you mean that kind of question, then it is definitely up to philosophy because no one else is even asking it. Everyone answers the question about P-Zombies every day, by deciding the people they meet are conscious, based only on their behaviour. The more interesting question is whether it is possible to get human like behaviour from a program running on classical computer.