Plato said his knowledge of Ancient Athens and Atlantis came from Solon, three centuries before him, who learned about them during a trip in Egypt. According to Plato's writings, Atlantis lied near the Strait of Gibraltar (the "Pillars of Hercules"), near the
Atlantic Ocean and the
Atlas Moutains, and conquered Europe and Africa around 9500 BC. That's Third Age to you, about eight centuries before the Awakening and some 2,000 years before Thera foundation, CLMC/PITM (assuming constant-length-mana-cycles and peak-in-the-middle). So, if he was talking about ED/SR Thera, he obviously got some facts wrong.
Mythical Crete and Atlantis share a Poseidon patronage, but I guess, so would have any powerful nation based off an island. In Greek mythology, bulls are often associated with Crete (the most famous example is the Minotaur). In the Odyssey, Homer also mentions as much 90 cities in Crete, which is not consistent with Crete as he would have known it in the 8th century BC (as far as our own modern archaeological knowledge goes). This suggests the Greeks still had around the 8th or 7th century BC some knowledge of the so-called "Minoan civilization" (the name was given in the 20th century in reference to King Minos, not the other way round) and its bulls worshiping thing, some three or four centuries after its fall (circa 1100 BC), eight centuries after the end of its golden age (circa 1400 BC). The Santorini eruption is a bit older though, probably around 1600 BC in real life.
For a useful comparison, if it wasn't for Earthdawn sourcebooks and fan sites, Plato and the Internet should know as much about Barsaive, the Blood Wood, the Kingdom of Throal and the War against the Theran empire, than they do about the history of the
Cucuteni-Trypillian culture, whose geographical extent and dates perfectly match.