Hey, man. I think Vekoma is refering to the corkscrew like element that is on stealth. They just reconfigured it so it's taken in the flying position this time, as opposed to Stealth where it is on your back.
Here are the "corkscrews" on stealth:
http://www.coastergallery.com/2000/PGA14.html I don't think that text is proof of X-flight and Batwing were meant to have corkscrews
-------------
- Peabody