My great-grandfather was a baker in Rome. Someone once asked him, after he moved to America, what he considered a pizza to be. His reply was “Dough, olive oil, and little fishies”. Based on that precedent, I’m willing to allow considerable latitude.
But I’m completely on board with “everything on it must be edible” rule. And even if the (lack of) rules in that competition technically allowed a pineapple stalk in the middle, that should still have been grounds for the judges to vote against it. Yes, the judges have rules, even if they vary from judge to judge and they can’t or won’t articulate what they are.