I regret it, but I have to be honest and factual here. The differences between northern and southern Italians are greater than those between regions in any other European country. We have incredible diversity. In shows up in fst analysis and all other sorts of ways. Ralph and Coop et al is instructive reading. On some level the OP is correct.
On another level, while there is a genetic break in Italy south of Rome found as early as Novembre et al, they also found a genetic break at the ALPS. We are all Italian.
THE IMPORTANT THING IS: Who gives a damn?
The only people who give a damn are Nordicists who think Europeans should be rated according to the amount of Southern or Southeastern ancestry they have. They've had to accept that Anatolian Neolithic is OK, because it is present in high percentages in all Europeans, but "Iran Neo" is somehow disgusting. This is a component found in people who built some of the greatest civilizations the world has ever seen. They also forget that Iran Neo is closely related to CHG, and represents half of the Indo-European ancestry they think is so superior. However, intelligent and logical discourse is not the hallmark of these people.
Just ignore these t-rolls and then maybe they'll go back to more congenial sites like that pit theapricity, or Skadi, or Stormfront, or even, sadly, anthrogenica, where they can get their socks to talk to each other and pretend it's all academic.
I guess the hints from the upcoming ancient dna paper from Italy has them all shook. Too bad.
Just please ignore him. What they want is attention to fill their empty and dysfunctional lives.
However, such an obvious attempt to be provocative and sow discord merits an infraction, and he will get it.