It's not misunderstanding at all - but your response is certainly an attempt to obfuscate the point being made. The moment you represent anything in code, you are abstracting a real thing into it's digital representation. That digital representation if fully formed at every cycle of the digital system processing it, and the state of the system - all the way down to the transistor level may be precisely determined. To say otherwise is to make the same error as those who claim that consciousness or understanding are indefinable "extra-ordinary" things that we have to just accept exist without any justification or evidence.
By an individual person, yes. I claim that there exists no single human capable of fully understanding the totality of the software and hardware down to the individual transistor level.
That's a very wrong statement. Pretty sure I could explain all the maths, all the physics, all the electronics, all the operating systems and all the user space of a single high level language operation, when I was a fresh graduate. Now, I have forgotten most of the physics and electronics, since the university was quite some time ago, but feel free to ask any decent student of an IT bachelor, they should be able to pretty much build the PC from scratch. Sure, modern processors and whatnot add a bunch of optimizations, but you seem to really overstate the complexity of the computer.
I'm talking about understanding, fully, the state of the CPU. Not just the conceptual operation of the CPU. Like, given a specific, modern AMD or Intel CPU, understand fully all states of all transistors.
I agree and never claimed that "a single person" could - but just because something is too complex for a single person to fully understand does not make it "mysterious" or a "black box". So what is the claim you are making? Anything beyond the complexity of a single person to understand = magic?