Why don’t hair transplants fall out like the hair you lost?

If most hairless is due to increased testosterone output can someone explain how a hair transplant saves your hair? Wouldn’t you just lose it again due to hormonal issues?

Genetic balding never impacts the hair around the back and side of your head (donor hair) so a hair transplant moves this hair and put it where you lost it. The donor hair never react to DHT so it will grow in its new location for your lifetime.