Look, first of all, none of us can be sure. And links on wikipedia no matter how many references they got, are not 100% reliable. They just have some level of reliability.
Trojans did speak Greek, Trojans did have Greek names, Trojan did worship Greek Gods with their Greek names(unlike the Romans who upon using a new language they had to rename the Gods as well, by also changing some of the background of the Gods)
Etruscans were initially a Greek tribe, called Tyrrenoi, who migrated to the north of Italy and after hundreds of years they grew and expanded their borders going as far as Rome in the south. It's highly probable that Etruscans = Tyrrenoi(Greeks), some Hittite tribe that migrated as well and some indigenous northern Italians. We can't be certain. All we know is that Greek tribes actually migrated there. They could have died in battle upon arrival from an already established Hittite tribe, it's all speculation. Let's accept that both Greeks and Hittites were part of the Etruscans.
Just as we say now that there are no pure races or ethnic groups, it was the same back then. People migrated all the time. Celts were everywhere. Greeks were everywhere. As time went past, Romans were everywhere, then Arabs, then Goths, then Saxons etc... It's all complicated yet fascinating. It can't be judged in absolute terms.
What is absolute, since this is a Cyprus Forum, is that Hellinism was spread from 1000 BC till today in at least mainland Greece and Cyprus. There are many other places, but what is important is this. By whatever means it actually happened, Cypriots speak the same language as a Greek tribe used to speak plus some differences from Venetian language(different from Italian), lots of words from the Francs and the Ottomans and some ancient Cypriot words that survived. It's still a Greek dialect, but not an idiom as it started off to be.
Get Real, did I challenge the fact that the Byzantine Empire was not the Eastern Roman Empire? How is that your response waiting for "round two" when all I said was that Rome was possibly founded and settled initially by ancient Greek tribes... How does your response make any sense to this comment?