I've only watched some videos a few months ago.
Geoffery might be wrong about the lightening, it might be something he hasn't conceived of or simply overlooked. Alternatively you might be overlooking the ability for ancient pre-egyptian peoples to direct atmospheric phenomena. They might not have even been working with lightening as we understand it currently.
Sure, I only mentioned red bricks as I seemed to recall an idea they served an electrical purpose in some video, maybe by Jon levi. But specific to pyramids is quartz based materials which is far more relevant. How do we know that it was even electricity being harnessed and stored.
I think Geoffery assumed the lightening had something to do with the flame phenomena and concluded that they were harnessing lightening. I'd be inclined to disagree. Dan winter speaks of a "cold flame" of implosion which I suspect is what this "blue flame" was.
On the theme of Kemtic pyramids, the Djed is also a signature element of this culture. Here are some very interesting ideas on the involvement of "electricity":
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