Furthermore, various structures securely dated to the Old Kingdom show only erosion that was caused by wind and sand (very distinct from the water erosion).

So where’s their water erosion then?

Just to save the downvoters some trouble, I’m only suggesting that theories which are not supported by direct anthropological evidence are worth considering. I’m not saying aliens - or Atlanteans or whomever - carved the Sphinx. The erosion theory was just the first thing I thought of as an example.

Back in the early 1990s, when I first suggested that the Great Sphinx was much older than generally believed at the time, I was challenged by Egyptologists who asked, "Where is the evidence of that earlier civilization?" that could have built the Sphinx.

They were sure that sophisticated culture, what we call civilization, did not exist prior to about 3000 or 4000 BCE. Now, however, there is evidence of high culture dating back to approximately 12,000 years ago, at a site in Turkey known as Göbekli Tepe. A major mystery has been why these early glimmerings of civilization and high culture disappeared, only to reemerge thousands of years later.

https://www.robertschoch.com/sphinx.html