Based upon what do they make this claim?
Do they just think that this is the best guess?
Or do they have a consensus of elite scientific minds who think this is the best guess?
It seems that is all they do in regards to archaeology, just make guesses and then proclaim them as being facts.
Just as their claims about how the pyramids were built, who built them and why they were built. All guesses and not based upon facts even, imo.
There are those who would claim that these marks are part of an ancient Egyptian schematic for a computer or something; for more about how the pyramids may have been built, I’ll be happy to post some links to other FR topics.