Just so you know, absolutely none of that is true.
https://en.wikipedia.org/wiki/Pyramidion_of_Amenemhat_III
I don't know if the person who posted that is sincere or not, but plenty of people sincerely believe this sort of thing when it is posted on Facebook.
It actually was black but it faded, honest.
And for people interested in the actual world as we understand it from SCIENCE, this: https://www.cnn.com/2024/05/16/middleeast/egypt-pyramids-nile-river-lost-ahramat-branch-scn/index.html - A mapping of a lost branch of the Nile, which makes the location of the pyramids make so much more sense.
I heard of this this morning from another source of great science, namely Microbe.tv, and This Week in Virology, specifically episode 1115, Weekly Picks from Brianne: https://www.microbe.tv/twiv/twiv-1115/
I too heard about this from TWiV. I was very grateful to have finished every back episode of Twitter just before pandemic hit. I felt I was actually prepared for things with the most reliable source on virology available.
I didn't realize there were that many pyramids... 😬