You are not even reading or researching, I can just tell by the abrupt response. You are out to prove yourself right with a foolhardy theory that "sebum causes hair loss". Accutane might impact DHT a little bit but so do common household spices. Doesn't mean it's impactful enough to benefit hair. Most accutane users experience hair loss, and in fact it is quite the epidemic when you look at accutane forums.
Again, if anyone has done the slightest research, it's obvious that of course sebum is correlated with androgens. A square jaw is also correlated with androgens. MANY things are correlated. doesn't mean that it causes hair loss. Sure, you can reduce androgens, and sebum and hair loss may both be reduced. But they are still independent factors.
Do less typing and posting, do more reading and research.