i'm new to these ideas, but i think it's more about linking this to the theory that there were more human civilizations i.e. along the coastline of the Mediterranean Sea 12k years ago, instead of the only 1 known settlement at that time, Jericho in the West Bank.

an example is there are no signs of where the builders of Gobekli Tepe came from. Gobekli is also around 11k years old, and a few hundred miles north of the West Bank. a theory is that the civilization that built Gobekli was erased by a massive flood in the Younger Dryas, maybe from a comet or asteroid impact, rather than a more gradual rise in sea level.

i think this ancient civilization theory also ties into the claim that the Great Sphinx is thousands of years older than Ancient Egypt, and that the erosion on its surface is from rain instead of wind/sand.

i don't have an opinion of whether these theories are true, but they are very interesting and fantastical to think about. plus, many of these theorists seem to be decent people, but were ridiculed for a long time. having more evidence to back them up, i hope they're taken more seriously, or at least treated more professionally.