Well given that the story of Atlantis is quite clearly allegorical, probably not. Although there probably was some sort of maritime link from Greece to beyond

Well given that the story of Atlantis is quite clearly allegorical, probably not. Although there probably was some sort of maritime link from Greece to beyond Gibraltar, the link to the Atlantis myth seems rather tenuous and moreover, isn't needed to explain where Platon got the idea for this ancient thalassocracy since he of course lived in Athens when they were doing similar stuff with the Delian League.