User blog comment:Kirkburn/Technical Update: October 14, 2015/@comment-24531999-20151016011938/@comment-11733175-20151017134702

Turns out it was added by a helpful user, not staff, following it's appearance on a forum thread. Judging by the history of the source code, it appears to have come with Ember (a js framework) so it's not explicitly added by wikia and came as a by product of something else, explaining the poor choice of name for the class and utter lack of namespacing.