> it doesn't say why a camera responding to a 550 nm photon isn't seeing red when your retina is.

It isn't your retina 'seeing' red. The retina is just translating it to the rest of the brain. When we replace eyes with silicon-based cameras (poorly, not in color, low resolution, but still) the patient experiences seeing again. Or going the other way, when you have a dream and see something red in that dream, you experience* (or at least, you have the memory of experiencing it) the qualia despite having your eyes closed and being asleep.