Earlier quoted context omitted.
“Of course it’s not real pizza, that’d have to be imported from the Pizza region in Italy”
That sentence works if you replace pizza with parmesan , or any of the Italian protected origin foods.
I don't know that "you can't call it X" is the right approach, but there should be some really clear to consumers way of saying "X was made to a particular standard" vs "all bets are off with Y" - then let them decide.