Based on that, it would seem like these could be some possibilities:
Maybe they enjoy “the game” or deception more than doing anything real with it. They may already have another alt admin in the making, or even made one already.
It’s a lot of time to keep up the same charade, so maybe they’re doing it as a job, with who knows how many more accounts already.
Or maybe they finally got bored with it, and decided to go out with a “POP!” while showing everyone their “superiority”.
For better and for worse, the Wikipedia attracts people good with words, which includes those capable of writing clearly, and those who can organize the whole project, and also those who enjoy playing games of sophistry to whatever end.