Sounds ridiculous to me. If they can't do light weight lifts without a belt, then their bodies will end up needing it like a crutch.
I personally don't belt up until I start approaching about 80% of my max for that particular lift depending on how I feel that day.
I know power lifters use the belt a little more strategically. I'm sure if Rodja sees this he will fill you in more on that aspect.