I could swear I remember that being true many years ago, but no longer. If I'm right, the site is simply out-of-date. The fact that no one's replied to your thread probably supports that.
There generally used to be a closer relationship between Stats and Skills, though many of the details were murky. Much of UO's math wasn't as well known back then. We just kind of let the math work itself out behind the veil.
Anyway, sorry for the reminiscing....My memory is that this (dexterity and snooping being related) may have been true but is no longer.
Hopefully someone whose memory is more specific will respond.
-Galen's player