The racial description of zombies was changed to that. In my opinion to
justify a great deal of lameass coding by wizards who never even bothered to
read the old racial description. Actually, with the advent of Twomi's
raceinfo, my own raceinfo page is so woefully out of date that it has the old
racedesc. http://www.megami.com/bat_race_zombie.php

The old desc STRONGLY implies that they are not undead.