I'm not sure what question you are asking. But I'm fine with the idea that materialism is wrong, if there exists physical world which is contained in someone's

I'm not sure what question you are asking. But I'm fine with the idea that materialism is wrong, if there exists physical world which is contained in someone's imagination. That's basically "if God exists, then materialism is wrong." In other words Chalmers has no psychic powers to verify that the world he conceived satisfy ~Q, unless this world exists in his imagination.