Many of these, such as carbonara, pizza, and tiramisu, were actually invented in the US

From the article you cited:

Pizza is a prime example. “Discs of dough topped with ingredients,” as Grandi calls them, were pervasive all over the Mediterranean for centuries: piada, pida, pita, pitta, pizza. But in 1943, when Italian-American soldiers were sent to Sicily and travelled up the Italian peninsula, they wrote home in disbelief: there were no pizzerias. Before the war, Grandi tells me, pizza was only found in a few southern Italian cities, where it was made and eaten in the streets by the lower classes. His research suggests that the first fully fledged restaurant exclusively serving pizza opened not in Italy but in New York in 1911. “For my father in the 1970s, pizza was just as exotic as sushi is for us today,” he adds.

It clearly states something different than your claim. Pizza was not invented in the US, it was popular in the US.

From Wikipedia:

Modern pizza evolved from similar flatbread dishes in Naples, Italy, in the 18th or early 19th century.[31] Before that time, flatbread was often topped with ingredients such as garlic, salt, lard, and cheese. It is uncertain when tomatoes were first added and there are many conflicting claims,[31] though it certainly could not have been before the 16th century and the Columbian Exchange. Until about 1830, pizza was sold from open-air stands and out of pizza bakeries.

Many sources state pizza wasn't popular in Italy as it was in the US, but your statement on it's origin is 100% wrong.