Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Story of Their Lydian Origin
In glaring contradiction to this simple and natural view stands the story that the Etruscans were Lydians who had emigrated from Asia. It is very ancient: it occurs even in Herodotus; and it reappears in later writers with innumerable changes and additions, although several intelligent inquirers, such as Dionysius, emphatically declared their disbelief in it, and pointed to the fact that there was not the slightest apparent similarity between the Lydians and Etruscans in religion, laws, manners, or language.
It is possible that an isolated band of pirates from Asia Minor may have reached Etruria, and that their adventure may have given rise to such tales; but more probably the whole story rests on a mere verbal mistake. The Italian Etruscans or the -Turs-ennae- (for this appears to be the original form and the basis of the Greek Τυρσ-ειννοί, Τυρρεινοί, of the Umbrian -Turs-ci-, and of the two Roman forms -Tusci-, -Etrusci-) nearly coincide in name with the Lydian people of the Τορρειβοί or perhaps also Τυρρεινοί, so named from the town Τύρρα.
This manifestly accidental resemblance in name seems to be in reality the only foundation for that hypothesis--not rendered more trustworthy by its great antiquity--and for all the pile of crude historical speculations that has been reared upon it. By connecting the ancient maritime commerce of the Etruscans with the piracy of the Lydians, and then by confounding (Thucydides is the first who has demonstrably done so) the Torrhebian pirates, whether rightly or wrongly, with the bucaneering Pelasgians who roamed and plundered on every sea, there has been produced one of the most mischievous complications of historical tradition.
The term Tyrrhenians denotes sometimes the Lydian Torrhebi--as is the case in the earliest sources, such as the Homeric hymns; sometimes under the form Tyrrheno-Pelasgians or simply that of Tyrrhenians, the Pelasgian nation; sometimes, in fine, the Italian Etruscans, although the latter never came into lasting contact with the Pelasgians or Torrhebians, or were at all connected with them by common descent.
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Reference address : https://www.ellopos.net/elpenor/rome/1-09-etruscans.asp?pg=7