I didn't. I have no idea where the Etruscan language came from (east, west, north, south, or right where it was). All that is relatively certain is that it wasn't Indo-European. The transmission of genes and a language/cultural package are two different things. Languages can expand, but also absorb other cultures (or be absorbed by them), while the genes of their original carriers can be progressively diminished, even disappear, over time. I don't doubt that the ancient population (a word with an Etruscan root) was largely genetically indistinguishable, regardless of on which side of the Tiber they dwelled.
I mentioned the Sea Peoples only because the Etruscans were renowned in the classical world as seafarers, traders, and pirates, in contrast to the ancient Latins who were, from all accounts, farmers and landlubbers. Does that mean I think that Etruscan-speakers (let's leave gene-bearers aside) can be traced back to a branch of the Sea Peoples landing on the Italian shore circa 1100 BC? No, but they scattered widely, need not have all been Indo-Europeans, and might have had iron weapons, which the natives likely lacked. So, who knows? Not I.
You mentioned the Bronze Age "gap" in the samples. A group coming in with the Copper Age expansion looking for metals (which Etruria had) can't automatically be excluded, it seems to me. Stuart Piggott in Ancient Europe archaeologically traces one such possible movement from the coast of the Near East, up the Adriatic, and then across the Alps to the Tyrol, with similar metallurgical technology and products cropping up at both ends. The Adriatic was named after Adria, an Etruscan port at the mouth of the Po. So, once again who knows?
As to what I'm reading now, it is History of Florence by Machiavelli. Florence is, of course, smack dab in the middle of Tuscany.
My paternal line (surname) came from Ireland to Virginia, possibly speaking Gaelic and as indentured servants, well over 200 years ago, then traveled to Pennsylvania, Iowa, Nebraska, and Bellingham, Washington, in the Pacific Northwest, where I was born. How much Irish "blood" still courses through my veins? My sister got tested (I haven't yet) and it said maybe 10%. I'm pretty much "Irish" in name only. If I claim it as a descent (from the Kings of Cork!), it is only when in an exceedingly romantic mood. (I have no children, but my sister's children are related to Chief Joseph of the Nez Perce Indian tribe through their father.)
Personally, I believe most "high cultures" are hybrids and can't be traced back to a single line.
I have always maintained, based on archaeology, and a knowledge of Etruscan culture, that there was no mass migration in the first millennium BC from Anatolia to Etruria.
I furthermore never saw why that mountain of evidence should be discounted by the report of a Greek "historian" who lived 500 years after the fact, especially when other Greek "historians" saw it differently.
Be that as it may, we now have the dna of the Etruscans. It most emphatically "isn't" the dna of Copper or Bronze Age Anatolians, or the dna of Aegean Greeks, who are among the best candidates for the "Sea Peoples", along with, of course, the Sardinians, the Sicilians, and the Etruscans themselves.
Now, if someone wants to believe that perhaps an "elite" came from Anatolia to Etruria in the first millennium BC to create the Etruscan civilization, it's no skin off my nose, but the reality is that the history and the archaeology is against them, and there is no proof in the genetics.
So, imo, it just looks like reluctance to give up cherished ideas, but hey, whatever floats their boat.
As to "ancestry" or "ethnicity", I'm in a different situation. I know exactly where my ancestors have lived for at least the last approximately nine hundred years, and it's in a certain specific area of Italy. So, I don't think I'm on shaky ground in saying I'm 100% Italian.
However, I do know what you're getting at. I too believe that layer after layer of migration and culture make up the modern ethnicities of today. That goes for every group, and perhaps for Italians more than for some.
Decades of reading about Italian history and pre-history have taught me that, if nothing else.
Clearly, CHG/Iran Neo ancestry is one of those layers. Heck, it had already arrived in Italy by the Neolithic, as I've been saying for ten years, to howls of derision I might add. I know it was in Sardinia and Sicily early, and I absolutely believe we'll see it in Southern Italy in the Bronze and Iron Age, and clearly it had reached the Latin areas by the first millennium BC, as per sample 850 as one example.
None of that has anything to do with the Etruscans and the "theory" of their origin in the Anatolia of the first millennium BC.,or with the original Italics, for that matter.