I think this might be more like going to a buffet that advertises you can eat "Anything On The Cart™", and then tells you you can't eat the potatoes which are right there on the cart, in the same dish as every other thing you can eat.

Then you find out that there are potatoes in many of the dishes, though only one is all potato. Does the rule apply to those dishes? At what point does it become a potato dish? Remember, eat the wrong one and you might get kicked out.