The way I understand to be, cutting off the “junk” is not just castration. That’s part of the procedure but it is not the whole enchilada.
They split it, then invert it. The patient has to dilate it, still sometimes multiple times per day, because the body is trying to heal the open wound. From what I understand, the people who get the procedure, let’s just say that from that part of the body the squirrel will never find a nut ever again. In some cases they have to redo some of the surgery as well because of complications with extreme mutilation of a man’s genitals.