I've never seen him admit to ever trying pillow practice, nor do I think he's really wrapped his head around it. It's actually a paradox to assume a little pillow practice here and there will cause you to play "into" anything... if anything, it makes rebounds MORE substantial because your muscles are being trained to pull the stick upward, absent a rebound. Students of mine and my personal experience, shows that intelligent and moderate pillow practice gives you muscular response that is hard to attain using a practice pad or bouncy surface. Usually critics and skeptics of something do little research, or have some automatic bias. There is no substantiation to the theory that pillow practice creates a "heavy handed" stroke.
I respect the opinions of anybody, but the assumption that a certain kind of practice ruins you, when so many other amazing drummers (Rich, Chambers) admit to using that method, is absurd.
Slack-tuned drums do not offer a rebound and cymbals offer a modicum of rebound energy to aid the upstroke. Relying on rebound will cause you to have technique problems when you encounter percussion devices that offer no rebound.
Tony is right on.