It's my belief that EVERYTHING comes from SOMETHING, there is no such thing as INDIGENOUS. (Sorry I don't read Italian so I could not read the whole article in that link. Google translate only gets me about 60% of it.)
If the Etruscans themselves were a "melting pot" why could there not be a component of the J1 from the Caucasus mixed in their civilization that survives until now?
I.E. SOME ETRUSCANS could be J1 originating from the Caucasus (say, 5000 years earlier) with this Y-DNA surviving until today?
Every area is a "melting pot". Every region in Europe has Near Eastern ancestry through the early Neolithic farmers who brought agriculture to Europe, or through the migrations from the Steppe, and in most cases, from both.
Obviously, the people who lived in "Etruria" in the first millennium B.C. would be a mix of at least the early Neolithic farmers (with some absorbed WHG or western hunter-gatherers) and some "Indo-European" groups of various names who came across or around the Alps and who were themselves a mixture of Near Eastern peoples, EHGs, and maybe some additional WHG. So, there would have been most probably a mixture of y lineages in Etruria, among which we would probably see some G2, maybe a few I2, maybe some E, and maybe, who knows, a few J1. Whether or not a group of more recently arrived people from the east were also part of the mix we don't yet know, and if they were we don't know whether they were anything other than a decided minority. We also don't know what yDna lineage they carried. Maybe it was J2. Maybe some J1 was mixed in, maybe it will be even more of a surprise...again, we don't know. Some J1 could also have arrived in Tuscany later through other migrations. There's been no fine scale resolution testing of the academic samples from Italy for J1 so we're in the dark here to some extent.
Over and beyond all of that, there's no way of determining at the present time when and with whom
your particularline of J1 arrived in Italy and then Tuscany. Even should it be determined that there was a migration from the east in the first millennium BC to central Italy and J1 was involved,
your J1 might be from a different clade which had nothing to do with it.
You may, however, have inherited some bit of ancient Etruscan
autosomal dna over the centuries. Your yDna is only one of your
many ancestors.