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. While this is clearly not for defense, it makes the boys come to the yard. Many players with male avatars have complained that they aren't getting fair treatment, but some enterprising and imaginative artists have proposed changes to level the playing field.
Many people see this as mere fanservice, while others see it as just following game industry cultural norms which is designed to appeal to teenage boys. Unfortunately, even WoWWiki has been victimized by this normal perspective and has been called out for it. There is little practical value in many of the revealing features in female armor. Fortunately, there has been some evidence this situation may be improving.