I'm guessing that he may be confusing a "flick" with an inverted stall with wing fall off. Hard to say for sure without a video or being there.
I've never seen a situation where a model stalled due to high positive G and snapped out of a loop as it passes over the top. Oh sure, speed falls off but so does gravity. So I'm inclined to think that it's a lack of sufficient speed to do a nice clean arc over the top and instead it's running out of speed and being loaded inverted and perhaps stalling out before the nose is pointed back downhill.