Well then I will state my opinion explicitly so that it isn't suggested for me.
I don't know who the Etruscans were nor do I claim to, what I shared were some rational enough points about the archaeology that made a case for Etruscans coming to Umbria, and not having been there.
There was a tradition among ancients that they did migrate there, and its obviously possible they were wrong and just spreading a myth, but many authors state variations of a migration, be they pelasgians, lydians, tyrrhenians, etc. Some variations consider pelasgians and tyrrhenians the same thing, some consider them different, some consider them lydians proper, but in common is a migration.
"The Pelasgians left Greece and came and settled in the Italian areas among the Aborigines. The Pelasgians were also called Tyrrheni [Etruscans] and the entire land was called Tyrrhenia, after one of their rulers, who was called Tyrrhenus."
Eusebius, Chronography, 102 - ca. 325 CE
"At an early period the Umbri were expelled from it by the Pelasgi; and these again by the Lydians, who from a king of theirs were named Tyrrheni, but afterwards, from the rites observed in their sacrifices, were called, in the Greek language, Tusci"
Pliny the Elder, Natural History 1-11, 3.8.1 - ca. 77 CE
"The Lydians, who had taken the name of Tyrrheni, having engaged in war against the Agyllaei, one of them, approaching the wall, inquired the name of the city; when one of the Thessalians from the wall, instead of answering the question, saluted him with χαῖρε"
Strabo, Geography, 5.2.3 - ca. 24 CE
"But if one must pronounce judging by those that still remain of the Pelasgians who dwelt in the city of Creston (Ancient Macedonia) above the Tyrsenians, and who were once neighbours of the race now called Dorian, dwelling then in the land which is now called Thessaliotis, and also by those that remain of the Pelasgians who settled at Plakia and Skylake in the region of the Hellespont, who before that had been settlers with the Athenians, and of the natives of the various other towns which are really Pelasgian, though they have lost the name,"
Herodotus, Histories, 1.57 - ca. 430 BCE
"There is also a small Chalcidian element; but the greater number are Tyrrheno-Pelasgians once settled in Lemnos and Athens, and Bisaltians, Crestonians, and Edonians; the towns being all small ones"
Thucydides, Peloponnesian War, 4.109 - ca. 395 BCE
"After Liguria are Pelasgians who settled here coming from Hellas, occupying the country in common with the Tyrrhenians"
Pseudo Scymnus or Pausanias of Damascus, Circuit of the Earth, 196 - ca. 100 BCE
"However, one may well marvel that, although the Crotoniats had a speech similar to that of the Placians, who lived near the Hellespont, since both were originally Pelasgians, it was not at all similar to that of the Tyrrhenians, their nearest neighbours"
Dionysius of Halicarnassus, Roman Antiquities, 1.29.1 - ca. 7 BCE
As you can see, many ancients either considered them the same or two different ethnos, and I don't know better than them as I am even further removed, but the motif of migration is pretty common.
And with the migration scenario, its still entirely possible they were non-IE speaking people not related to anybody.