The way he made it sound is a torn/severed nerve. Some things you can't recover from.
The funny thing is, the entire professional team tossed everything onto the virtual whiteboard to diagnose, including the brother's visits to the clinics with MRI and localized exams, resulted as something else. We ruled in nerve severity, fraying nerve branch, and even nerve pinched nerve. None of that was relevant. We traced the entire thing to something deeper, much higher up the dorsal and perineal nerve branches, way way up to the sciatic nerve bundle. There is a hidden monster that requires greater attention between the sciatic and pelvic floor, and even the prostate pathway. There are so many phantom symptoms diverged and resumed between this region. It's not the penile area but closer to the pelvic regional floor. The nerve is one thing, but there is also a higher suspicion for the blood vessels and prostate-urinary health.
Most every PE forum I've ever been on has a ton of warnings on any beginner MOD post. Even on individual exercise postings, if you do this incorrectly, usually by applying too much weight or pressure for too long before your body has acclimated to the process, can cause serious if not permanent injury. You do these exercises with caution, exercises which you choose to do to yourself. No one is forcing you to apply that much weight, or do that many reps, or use that high of a pressure, or strain for that long. Beware! You only have one penis, listen to what it tells you, treat it with respect.
Exactly! Caution in PE is essential. Those who have been through PE for over the decades will warn the young bucks and new journeymen to be very cautious on their own journeys. PE has always been a marathon and never a sprint. Those who have injured themselves because they were too zealous create a large tapestry of cautionary tales. When profit-chasing entities try to announce new and better techs for faster results, we approach them with extreme cautions and evaluate every aspects while collecting data. But, our forewarnings are merely soft words in the blizzard of "I need fast gains and I don't care how."