I’m not quite sure how this threads with my reply. I’ve made no mention of overpopulation. Any attribution as to cause of the flood in Greek, pagan or other beliefs would necessarily follow the point of view of the fallen angels and their progeny, under this interpretation, so it stands to reason that it conflicts with Genesis at base but contains certain broad themes that are remarkably similar. It would have been a matter of perspective.
You wrote a thoughtful post, sorry I didn’t give it due process as I just scanned it - tired - past bedtime. Genesis and flood jumped out so I wrote what came to mind. Good-night. :)