Then I'll say it: he should go around 6 inches deeper. The squat seems to be the only lift where powerlifters will accept a partial range of motion. You don't see guys benching to an inch or two off their chest then being able to claim they "benched that weight." Should be the same thing with the squat in my opinion, you can't just not complete the eccentric and then claim to have completed a full rep.
This is a squat: http://www.youtube.com/watch?v=WK7m6I5m6gY
edit OP you are still very strong and this is an impressive lift, I'm just saying that to me it's a partial rep, though it would get passed in pretty much any federation.