This is just not true. At least, I've found it's not true whenever I use it. The Carbonite "Guide" has been broken for years. It rarely, if ever, points to the 'closest' anything!
Also, the Carbonite Home page is still wishing everyone "Happy New Year." I guess they may as well leave it there, since a whole year has nearly passed by.
The screenshot is from TBC so it's long time ago, imagine how much the game API have changed and how inefficient the current coding has become. The whole addon needs an overhaul, that's a lot of work.