Yeah, but the northern part of the peninsula is broadly more culturally uniform than Sicily and Sardinia, and while the exact borders fluctuated a lot and was mainly made of city-states for a long time, there had been past kingdoms that unified the North peninsula much more recently than either of those two regions. “Italy” as a term really only referred to the northern peninsula, for the most part, for well over a thousand years.
It happens pretty frequently in tech job listings, to have a requirement listed for more years experience in some technology than that technology has existed