If someone claimed running was faster than walking and then I told a story about how I once saw someone running in snow shoes on the grass and it was slower than walking then that would just be muddying the waters.

I remember a quote, I cannot find the source for now, but it basically says "A book can either be completely correct, or be readable, but not both."

Yet the article is literally is also showing a current peculiarity (user-space memcpy being faster than kernel-space memcpy) that may be or may not be true for your platform _now_ or in 3 years from now.