An utterly absurd contention. Pizza is documented in Italy going back to antiquity. The difference is that Americans see pizza as some sacrosanct thing with an approved list of acceptable toppings and anything else is some kind of heresy against authenticity.
Italians, on the other hand, see it as a piece of flat bread you put stuff on.
“An utterly absurd contention.”
Just made a quick DDG search.
Apparently, the controversy rages, with large numbers of partisans on each side.