Are you implying the underlying cause is never a brain malfunction?
I think of it a little like phantom limb pains If you feel pain in a hand or foot that you no longer have, retraining your brain is one way to fix it. Maybe regrowing a foot would be better, but we don't know how to do that.
I'm not doctor or scientist, but I think of it like the nerves in the ear are signaling off constantly. The brain is operating normally by listening to them, but what you really want is for it to adapt and start to ignore the bad signals. The brain can phase them out, but it can never stop receiving the signal, so you still hear it if you consciously focus on it. It sounds like this person is already there but still looking for a real cure, something to stop the signals.
I think of it a little like phantom limb pains If you feel pain in a hand or foot that you no longer have, retraining your brain is one way to fix it. Maybe regrowing a foot would be better, but we don't know how to do that.