“A complete map of which neurons fire still doesn’t tell you what red looks like” is just the knowledge argument, which Dennett has answered at length. Stating the opposing view fairly requires stating its answer.

Fair. Dennett’s reply to the knowledge argument is that what red looks like is a set of functional dispositions, and that Mary in Frank Jackson’s thought experiment would not learn a new fact on leaving her black-and-white room but acquire new abilities. Jackson himself later abandoned the knowledge argument, which is worth knowing. The debate is not settled in either direction, and both moves should be on the table before you decide whether the hard problem is real.