This article is silly. Coming from a source other than the computer games, trading card game, novels, RPG, or manga, its content is not part of official Warcraftlore, but nevertheless has become part of the culture belonging to the World of Warcraft community.
Female armor tends to cover less than does male armor. Though there are many people who see this as mere fanservice, there are real, practical reasons behind it. First, females are statistically less muscular than males, and depend more on agility and cunning than raw strength in combat, thus lightweight armor makes more sense. In addition, a male combatant, faced with an attractive female opponent wearing revealing gear will usually hesitate and stare, even for a split second, thus conceding the advantage in a fight.