Atlantis: truth or myth?

Plato refers to Atlantis in his dialogues. He says he got this information from the initiates of ancient Egypt. Plato was a serious writer, so this information must be true. It recalls the migration of the Arias that passed through ancient Egypt and went to Atlantis. In antiquity there were several catastrophes that originated legends like the flood. But, moving tectonic plates, erupting volcanoes (Vesuvius in Pompeii), tsunamis, etc. Happened. Was Atlantis myth or truth? It was true. This island continent (like Australia) existed and was located in the Atlantic Ocean, as Plato said, after the Pillars of Hercules, that is, after the Strait of Gibraltar.