Why do Italians from Abruzzo on GEDmatch cluster with other southern Italians, and Greeks?

[Sikeliot]

Abruzzo never had a Greek colonization, but they cluster not very far from far southern Italians (Sicilians, Calabrese) and Greek islanders. They probably cluster a bit more to the south than a number of mainland Greeks.

Is this proof that the pre-Greek population of southern Italy may have had strong Aegean influences to start?

[Guapo]

Slavs

[Ulla]

GEDmatch is overrated.

[Volscian]

Calculators are just genetic astrology.