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https://en.wikipedia.org/wiki/Mead%E2%80%93Conway_VLSI_chip_...

I'm guessing is what they're really talking about. Which is not about NAND gates.

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Just to add a bit, but modern digital circuits are almost exclusively MOS, but even the "complementary" bit isn't universal in a large IC.
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I believe you're not ignorant. But many folks probably lack the process knowledge (CMOS) required to understand why :-)
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