What you want, is for your nuts to be held back, so your shaft skin stretches (instead of allowing skin to be 'stolen' from your balls). That is the very definition of turkeyneck, which he is trying to prevent.
I'm hanging BTC right now (Between the Cheeks) & it's giving me a turkeyneck (since my package is shifting downward). I'll probably spend months hanging SO / OTS/ SU just to work on the turkeyneck issue. From what I've read (at least on other forums), there's no cure for turkeyneck, just ways to minimize it.
Hopefully supra didn't disappear because he broke something