Just saw this vid elsewhere and figured I'd do a search here before posting, nice to see we are hot on the trail already!

Looks like a pretty solid case to me. The one question being left unanswered is what caused the rush of water past that big volcano due west to wipe out the city and sweep all the debris out into the ocean where it caused that big landslide?

Thats a large tectonic or volcanic event. And presuming not volcanic, since otherwise the sky would be blackened with dusts over probably most of the then-civilised world for weeks and it would have been recorded in literature. And if not a quake, maybe an asteroid strike somewhat nearby that didn't also hit everything around the Mediterranean with tsunamis.