1. Preventative treatments - These are to stop hair falling out and cannot regrow dead follicles, these treatments are minoxidil(topical liquid applied to head) and propecia(a pill which has sexual side effects).
2. Hair Surgery - A Surgeon removes hair follicles from the sides and back of a patients head and then implants them into the balding area(Elon Musk had this procedure). This is limited by how bald the person is as you cannot take too much hair from the sides/back as it looks bad.
So when reading towards the end it looks like the researcher found a way to 'clone/culture' hair follicles, so basically this will allow hair transplants of 'unlimited' amounts of hair see #2 that will never fall out at least is how I read it, please correct me if I am wrong.