[JonathonW]

Cochlear hair cells are fundamentally different types of cells than the hair follicles that produce the hair on your head; the name is more than a little misleading in this respect. Cochlear hair cells get their name from hair-like structures called stereocilia that project from the surface of the cells; they don't produce anything like the protein filaments that make up human hair.

A treatment that happened to have application to both male hair loss and hearing loss due to cochlear damage would be a really weird coincidence.