Or it was an invented rhetorical element.....
Ireland
I think that's an overused cop out when it comes to old stories. Especially those which appear in the bible or other compilations which has old stories repurposed for cultist dogma.
So you think it's more likely that:
there was an island situated in front of the straits which are by you called the Pillars of Heracles; the island was larger than Libya and Asia put together
And
There was a great and wonderful empire which had rule over the whole island and several others, and over parts of the continent, and, furthermore, the men of Atlantis had subjected the parts of Libya within the columns of Heracles as far as Egypt, and of Europe as far as Tyrrhenia
All evidence of which was destroyed but knowledge of it was passed orally in multiple cultures for 8000 years, only to be used by Plato as an allegory.
... Than that Plato invented a story for rhetorical purposes?