The article postulates that "everyones" definition of consciousness is "experience of any kind whatever."
That's not my definition at all.
My camera is not conscious because it experiences images.
My speakers aren't conscious because they experience the sound vibration they emit.
Consciousness may be an important part in us humans interpreting our experiences in some context, but it is totally different from those experiences. I can be conscious for a while in a sensory deprivation tank!
Separately, saying we "know nothing" about physics, just because we have to experience physics through our senses, is somewhere between disingenuous and false. We know how to predict the behaviour of physical systems very well. We know much less about how to predict conscious systems. So, if by "knowledge" you mean "ability to predict outcomes, possibly as result of stimuli," we know physics much more than consciousness. Or, perhaps, we know simpler physical systems, but but the complex systems that give rise to consciousness -- again, we know more about physics than consciousness, but not enough physics to explain consciousness as a physical system.
Finally, arguing that the mind is just its physical/chemical make up requires a lot more proof than we currently have. That argument reduces to "there is no free will." It may be true, but we don't know enough of quantum processes in the brains function to say that for sure. We certainly can't simulate or predict a couscous human brain yet.