Tim was a coach for a long time, but I don't remember him ever judging.
@barbara_dewey Do you know something I don't about this?
That said, he's always known the code well.
ETA: I didn't see the US broadcast. I do think that Tim and John both are very sympathetic to gymnasts. Sure, they may not see every error, or they may disagree so strongly that they aren't willing to accept the rules as they are. But I think that they are more likely feeling defensive of the gymnasts. And honestly, I don't blame them, as the rules are tough. Not nearly as ludicrous as WAG rules, but tough.