One possibility. It could be that Minoan civilization’s upper classes taxed their productive people so much, that when Greek cities arose, the skilled Minoan craftsmen left for other places with less of a tax burden
I detect what appear to be mistakes in the article. I don’t think that anyone who examined a map believed that Crete was destroyed directly by what came out of Santorini’s volcano. My theory is that a very large tsunami wiped out Crete’s waterfront, most of the ship building facilities, and killed a lot of the skilled ship building workforce. Ships at sea were able to return and maintain a degree of civilization, but a lot of Crete’s power was gone as they could not build up their navy quickly after such devastation. This made them vulnerable to depredations from mainland Greece. Also, a lot of rich people living in the hills lost the income from ships and could not support the fine arts they once did. So the skilled Minoan artistic craftsmen left. I think some ended up in Amarna, the new city built by the monotheistic pharoah Iknatan. The art there has a naturalism and freedom new to Egyptian arts and crafts.