subjectivity is subjective. its axiomatic. no one argues that everything is reducible or reductive. ever heard of the explanatory gap? no, we have axioms, which are self-evident, that subsequent truths are based on. axioms are the epistemic grounds of reason, and consciousness is the epistemic ground of all knowledge and experience. no consciousness - no knowledge. and just because we can't prove it objectively doesn't mean it doesn't exist! how absurd!
Dennett's arguments are not taken seriously in many academic philosophical circles. There is a joke about the title of his book, ever so humbly titled "Consciousness Explained", that is should be retitled: "Consciousness Explained Away".
If that means nothing to you, then I suggest you read some more philosophy of mind to understand why subjectivity is a real problem for eliminativist theories.
> consciousness is the epistemic ground of all knowledge and experience
Fortunately not!
> Dennett's arguments are not taken seriously in many academic philosophical circles.
Haha, I don't know what bubble you live in, but the majority of philosophers are physicalists. See the survey done a few years ago:
In fact, nearly every single one of Dennett's positions are held by the majority of philosophers, ie. physicalism, Compatibilism, realism. So much for Dennett not being taken seriously.