Earthquake generated tsunami travels at greater speed than wide-waves (i think that's what we've been told) and do not have to be 1,600 feet high to wash over land of the same elevation.
I admit I'm assuming that land elevation was what the hail (Atlantis) Frau was talking about...
Yeah, I didn’t find the whole hypothesis of this guy intellectually rigorous. There’s a link earlier in the topic, a Google search on topics about the Etna landslide, which dates to about 8000 years ago; something like that would more than do the trick at Sardinia, and Italy was (and still is) lousy with actrive volcanoes, both on land and offshore. As you said, the initial wave wouldn’t have to be 1600 feet high to reach 1600 feet elevation, case in point, the Lituya Bay splash in the 1950s, which was caused by a landslide, and the bay is fjord-like; the debris line is over 1700 feet elevation, or a third of a mile.
Land level was probably much lower. Sea levels have changed significantly sine the last ice age.