Having internal mental experiences causes my brain to send physical signals to my fingers in order to type the words "I have internal mental experiences". A philosophical zombie would type those same words, but they would be caused by something else since by definition it lacks those experiences. That would be rather surprising, and it would be even more surprising that the words that the zombie emits coincidentally correspond exactly to the experiences that the non-zombie has.
(See https://www.lesswrong.com/posts/fdEWWr8St59bXLbQr/zombies-zo... for a much longer version of this argument)
As the article says the alternatives (that the author seems to favor instead) boil down to "there's some physics we missed" and probably that's the point where we differ. I find that implausible, what would that be? Consciousness quantum field? Consciousness boson? If it's going to be interacting with matter it has to have a way to do that.