I'm not even sure why I brought up the nuclear winter thing. Sorry.
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"Possibly related to the year without a summer..."
Pyramid was built in 1814 BC.
https://en.m.wikipedia.org/wiki/Pyramid_of_Amenemhat_III_(Dahshur)
Year without a summer was 1816 AD.
https://en.m.wikipedia.org/wiki/Year_Without_a_Summer
Well they did say possibly
3,600 years apart? Um... sure! ;)
By no means am I on board with this. But what I think what was meant was that it was blackened in 1816, by what I think he was inferring was a nuclear blast, resulting in a nuclear winter or a year without a summer.
And the year even lasted several years!