Some reflections about these studies that I have also reported elsewhere: it's true that anyone can work only with what is available, and evidently the harbours are generous with human remains more than other places. But it's also true that starting from a sample of dockers and projecting their results on the whole of Roman Italy to represent the overall genetic picture is not very convincing.
It has long been known that, for example, among members of imperial fleets, finding an "authentic" Italic was an almost impossible undertaking, from the earliest times and for precise military provisions, because almost all of them were of servile origin and / or - according to the center (Miseno, Ravenna...) of provincial origin: Greek, Balkan, Levantine, North African, Sardinian and Corsican. It's possible that many of them, discharged at the end of the military service, remained in the area and started a family (it could be the case of Ravenna, which I know well). This is an old article published in the Treccani Encyclopedia, but if you have the time and the desire, you can scour the inscriptions of the CIL or PLRE
http://www.treccani.it/enciclopedia/...a-Italiana%29/
Having said that, and having little and no geneticist skills, I limit myself only to some considerations more of a historical / literary and mythological / legendary nature, often scholastic knowledges, which should avoid us being so surprised before these links with the eastern Mediterranean world. I don't know what the new genetic samples of these ancient Romans will say, but wanting to associate the "Levantine" contributions solely with massive movements of the imperial or late imperial age seems to me a bit naive. As Pax rightly said, the idea that this component was distributed with the measuring cup along the entire Paeninsula is a bit funny.
If I had to make a bet, I believe that even in the future we will not find a unique position to establish who or what was the "true" Roman of Antiquity. Meanwhile they were the first to know that they were somehow mixed from the beginning, not attributable to a single group, it does not seem to me that they made a great mystery of it, quite the contrary. The scheme of the archaic distribution and merger between Ramnenses, Titienses and Luceres, although it may be a simplification, should already offer us an important caveat and talk about an ethnogenesis not entirely linear.
But going back to this Greek-Levantine quota that causes so many tummy aches, I’d remember that the Romans recorded in their historical sources - and I'm talking about ancient phases - not indifferent contacts with that world, and I believe that in the long run they admitted a partial origin or mingling with the Greeks. The most paradigmatic case, on which all of them have been slaughtered, is the famous theme of the Tarquini dynasty, Etruscans, but according to the narrative direct descendants in paternal line of Demaratus from Corinto, reported by series of authors including Cicero and Titus Livius. Read it as you see fit, but it is to some extent symptomatic of a possible significant mobility of peoples among the Greeks and the Roman-Etruscan world (in the contribution by Ampolo, which here I paste, there is a section dedicated to some epigraphic evidence that would seem to indicate Greek presences in Rome very dated).
On the even more archaic phases, which in my opinion are the ones most involved in the arrival of the Aegean / Anatolian / Caucasian... genetic component in Italy, we have no historical sources like the ones mentioned above, but we have some mythological / epic / legendary support that his way provides a (albeit confused) memory of complex upheavals of peoples occurring - among other things - precisely at the end of the Bronze Age. In my personal way of seeing the material of the "Nostoi" (for the little that remains), which reports the events of the Achaeans after the Troy war, like the legend of Anthenor, coming back to the west towards the Adriatic sea, until he settled in Veneto, and in the end the Eneide itself - with Aeneas and her family sheltering in Latium - it seems to me that they testify that in the Mycenaean and/or Anatolian /Hittite world the Italian Peninsula was not something so far away, but a known and sought-after destination in some critical phases of their history
https://www.academia.edu/36759719/De...iC2cHff3Ad_SKY