1. That's not what Martin and Dipiro are, in their plain clear words, saying.
2. I can turn without a lot of absorption in bumps.
3. It's possible to ski a round line and control speed with very little absorption, and it's possible on mellow blue bumps to ski without turns, and control speed solely with absorption. Which again seems to bear out the plain clear words of Martin and Dipiro. They're not try to say something in Latin by speaking English.