Melanie, I remember seeing that information about the time they made the change to require all living profiles to be unlisted. I believe that, since then, it has been changed to not permit any kind of members to be unlisted. I could certainly be wrong, since the rules change so frequently and the help pages are rarely kept up to date.
EDITED TO ADD: Come to think of it, how are we supposed to know if a member who is unlisted is a guest or family member or how active they are?