Is "auditory neuropathy" something where there isn't any other existing treatment that directly addresses the issue versus compensating for it (like cochlear implants)?
The 'neuropathy' part is meant to imply that the issue isn't with the hearing mechanism itself, but rather with the part that allows the mechanism to communicate with the brain. In this case, the expression of a specific gene causes the creation of a specific protein which plays a role in the transmission of audio to the brain. This gene was either not present or malfunctioning, so they added the proper gene manually.