This solves the mystery as to why the Sphinx has waterline marks on its base due to suspected flooding!
This theory seems viable. There would be other implications also about transprt of materials to build the pyramids.
Not even close. The face of the sphinx enclosure was eroded by thousands of years of rain (or, if arid conditions are much more ancient, then many more thousands of years).
Not least the question of how did the millions of slaves have enough water to drink and take the occasional shower...