I've written on the subject before, so I consider it my professional duty to read other people's ideas about why zombies are impossible.
This one in particular is terrible.
As a requirement for the argument, Teed Rockwell states that there is no such thing as direct awareness. Obviously this means that all awareness is indirect.
This can be disproven with a linguistic construct. "All awareness in only known indirectly through ____." But of course, because ___ is direct, it doesn't exist by assumption. Therefore, if Rockwell's was the only argument that zombies are impossible, the the fact that we experienced reading the argument would prove that zombies are possible.
Notably, I don't particularly care if zombies are possible or not. If they are, then obviously consciousness isn't physical. (For the reasons analyzed in the article.) If they're not, then the only way to have physical consciousness is to assume that the problem of consciousness is unsolvable, but the stuff just exists, as all physical stuff just exists.
Because this is philosophy, there is no reason you have to choose one or the other - there is no experiment we can do to distinguish the two. (Barring the mind node working, for the moment.) As such, even in a purely truth-loving world, there would be at least two viable philosophies, of which you just pick the one you like best.
Because of this, any large group of people whose thoughts follow an obvious coordination signal are almost certainly not following the truth; on certain key subjects the truth is ambiguous. On these key nodes, you would expect a characteristic statistical divergence, and like this one, a divergence with noticeable philosophical knock-on effects. There is a good reason academic philosophy is divided into schools.