This article seems to be aimed almost entirely at those who already agree that physics is going to have to change to account for qualia.

Not quite. It is an experiment in seeing whether the people who insist that there is no problem may be moved by seeing a concrete alternative, rather than being told that their existing account of color, etc, is inadequate. (See first paragraph, last sentences.) No success so far.

What do I think of Dennett? It is a while since I read him. But while of course I disagree with him, I think he is a superior exponent of the true consequences of standard physicalism. I have accused most physicalists of being stealth dualists, who posit an association between, say, color and some computational or other physical property, but call it an identity. Dennett simply says, there is no subjective color (which he calls "figment") and no unity of consciousness ("the Cartesian theater"). These are just intersubjective figures of speech, etc. And he's quite right: subjective color and the unity of consciousness do not exist in standard physics. But they do actually exist, which is why I've posited a monadic physics. A conscious monad is a Cartesian theater, a place where the components of conscious experience are genuinely simultaneously present, and among those components are color sensations.

Responding to your other question - heterophenomenology is where you agree that other people's phenomenological reports must be explained, but you feel no commitment to the ontologies implied by taking the reports literally. In principle, I have no problem with that. People can be wrong. But I disagree with Dennett's specific eliminations, and especially want to show that they are not necessitated by physical ontology, because physical ontology can be different.