OP: You should not be bothered. The author's arguments are perfectly valid IMO, but they're way way beyond a beginner level. C is already a fairly challenging language to get your head around, and the author is going way beyond that into arguments about the fundamental theoretical underpinnings of C and its machine model, and the hellish complexities of modern microcode-and-silicon CPU design. You don't need to worry about it. You can progress your development through:
Basic computer science data structures Python and the like
C and the byte for byte realities <- You are here
Step 3
Step 4
Microcode realities like this guy is talking about
... and not worry about step 5 until much much later.