As much as people make fun of him for caring so much about a seemingly minor point, I've come around to understanding RMS's frustration about people calling all of the GNU project "Linux". This sort of title drives home why: neither Linus nor anyone else on the Linux project had anything to do with any of this.
If someone wrote an article titled "Windows utils that you might not know," I would not expect it's content to be solely applications written by Microsoft.
I think a better title would probably be "Common Unix utils that you might not know" or "GNU Coreutils that you might not know" (as some of the things that he is using seem to be coreutils-only?)