Plato's Kritiass

There's literally zero mention in any other source. This is a complete stand alone story from Plato. The Kritiass story where he starts to describe the island, that comes immediately after this story of the son of the sun god riding through the sky on a flying chariot and then getting blasted by a thunderbolt. We're not exactly bookending the whole thing with serious history anyway. That's not what he's about. He's a philosopher. He's not a historian anyway. So familiar figures are there. Poseidon, Athena, and Hephaestus. But as you said, no other Greek text references it back. It doesn't reference any others.