This is just from my reading of the site and posts here, but from my understanding, the benefits to hearing and tinnitus both come from causing the specific sodium gated potassium channels that are being targeted to cease hyperactive firing and self-regulate. So it's like if all the lights in an intersection got stuck on green -- the tinnitus is all the cars that aren't supposed to be getting through and are and the hearing loss is all the cars that are supposed to be getting through and aren't.
Part of this is pure optimism, but though there are multiple channels that could be targeted, it does sound like Autifony is aiming at the right one. It's a finite list and they quite definitely set out to regulate a specific channel, one that has not been deliberately acted on pharmaceuticaly before.