The part of that page that confused me is right above what you quoted: "Notably, using native code on Android generally does not result in a noticable performance improvement."
Yeah, I agree that the page is confusing. It seems to contradict itself. My guess is they consider games a special case, or something.
A friend of mine does iPhone and Android development and his comment is that NDK is basically a requirement for any non-trivial games on Android.