They just haven’t explained how it was preserved. Lots of clay soil down in this area of Texas. People have to get good topsoil and get it dug in to grow good gardens in some places.
There is a lot they can’t explain about the ancients.
Aliens from outer space? LOL, who knows about the pyramids?
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The Egyptians, Africans, and Muslims don’t seem to be able to live up to the alleged achievements in architecture, construction, agriculture, socializing peaceably, education, science, surviving, self-sufficiency, prosperity, etc, that they all brag of from thousands - much less only hundreds - of years ago -
It must kill them that Cleo was not actually an Egyptian.....