I am pretty sure this is what they mean
But then again, everyone has their own particular anatomy, habits and positions that work for them. The one problem I have with wrist rests is that they are often too low for me. Especially the ones that come attached to the keyboard. Maybe I let my hands hover too high on occasion, but I always thought I was a pretty traditional home-row typist, and I found most wristrests to be utterly useless.
Personally, when using a wrist rest, I also rest on my palms not my actual wrists. If I were to do that, my fingers would end up somewhere past the numeric row.