What Alex Lee does works for him, certainly, I would never tell him to do it another way. To clarify, I don't mean to say that what he's telling you is "wrong", but it's extreme, and it doesn't work well for everyone. Hard contact is good, and I like it - but to say you want it to hit so hard that it would fly away from you if you didn't control it in my opinion puts too much emphasis on excessive hip extension. Again, however, that may be a cue he used to get you to do something and not a perfect description of what he actually wants - I do that with my own lifters sometimes.
This article talks all about my opinion on this particular topic - http://www.catalystathletics.com/art...?articleID=125