You ask a very interesting question. If I remember correctly, I might have answered your early post and described perineal surgery as (and I can't remember exactly...but)an older style surgery.
As far as I know, none of us here are urologists. However,This group has an incredible amount of "Non-professional" medical knowledge.I am always happy, though cautious to learn from them.
My comment came from a golf buddy, who retired from his urological surgery practice over 20 years ago. When I shared my new condition with him he described how they use to do perineal prostate surgery back in the 1980's. He disclaimed any new surgery knowledge and applauded the newer systems with less blood loss.
The interesting point that you make, is that a skilled surgeon, even using an older technique, can have a very successful result. It points out again that there are many successful solutions to this medical problem.