He post some pictures at his website and I know a guy who on this regimen and with diet changed reversed his male pattern baldness.
He is so popular because his regimen offers something that finasteride is not able to do - cover all types of hair loss. DHT is main factor, but he reduces this by balancing many other hormones. He cover also cortisol, which you can never manage and in fact when finasteride causes anxiety in some, their cortisol spikes so bad for hair. On finasteride, you are missing important point and it is oxidative stress, inflammation etc.
Yes you can say that without androgens noone would be bald, but DHT is only persecutor and consequence of other things. DHT is the main factor in some cases only and in others, those that dont respond to Finasteride or Dutasteride, there are other ones.