Significant Find by the Israel Antiquities Authority

[Brian37]

Then there's the idea that the plagues of Egypt were the result of the Santorini eruption.

Problem there is that a) Santorini has been triangulated by ice core evidence, dendrochronology and c14 dating to 1628 BC, and b) Egypt suffered only a mild direct impact from Santorini as the ash cloud was blown to the North East - bad day to be in Anatolia or the Greek Islands - but other than some tsunami effects on the coast Egypt was in the clear.

I think you are missing the point. This is no different than all the independent flood myths in human history. And in the last episode of COSMOS Neil Degrees Tyson went into all the comet myths worldwide throughout history. Legends spread and overlap and throughout time. Natural events viewed by ignorant people get turned into legends and myths and end up in religion. The volcano was local region wise so those close to it still could have spread word of the event outwards and away from the volcano when they managed to escape.