They're neat as hell, and I was willing to give him a shot, but once he started off with the wide-eyed "this could not be done by conventional methods!" stuff, I called it quits.
For those unaware, Mehler is essentially the Captain Woo of Egyptian history, and insists that they had super-advanced technology that all just mysteriously vanished in a mysterious cataclysm... Essentially an argument from disbelief - he can't believe that the people of Egypt could make precise angles and flat surfaces, so he comes up with these goofy idea of ultramodern technology that vanishes - all of it, every scrap.
Part of this is perhaps excusable - there's a lot of misconceptions about ancient Egypt, primarily the notion that all the work was done by slaves. Hardly! The men who worked on tombs such as this were experts of their craft - they'd have to be, to get such a prestigious job, fashioning the eternal homes of gods-on-earth. Each of these master craftsman was under the oversight of an even more skilled master, probably someone who had done projects like this several times before.
of course the Egyptians were working with "primitive" tools... but they knew how to use those tools to the best possible result. Also often overlooked is the use of grit, water, and oils in this sort of work. It's really not difficult to get a polish like that; all you need is water, grit, and labor to create the friction. Same as a rock tumbler. The nagles were easy to achieve as well - it's not as if angle tools are a recent discovery or anything.
Another part is... well... prejudice. You run into a lot of woo-woo stuff about Egypt, about the Inca, Maya, and Aztec, about Zimbabwe and southeast Asia... but you never hear these guys talking about how the ancient Greeks or Romans or Cretans "must have" had some hypertech to produce their amazing monuments and buildings; it's assumed that Europeans had the know-how and skill, while the rest of the world are basically monkeys whacking rocks together.
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