I think his example proves the opposite of what he intends. His example is just begging for a discussion of how the approximation actually works, edge case considerations, error bounds, assumptions, limitations, complexity, and references. At least that's what I would want if I was looking at it with fresh eyes. Sure, the author's contact info is a little tongue-in-cheek but without comments I can only know what the code does, not what it's supposed to do.