Probably just some kid trying to be funny. Seriously who would think it's a good idea to submit BS stats in such a massive quantity? Better question is, who would find enjoyment in that? The people like this are the kind of people this community, and the world doesn't need.
*snip*
Not to sound cynical, but this whole situation didn't really shock me at all. It was a little confusing at first, yes, but in the end I found it rather amusing. It drew some much-needed attention to the site for a little while, at least. :P And honestly, while I've never heard of someone submitting fake stats to such a large scale as this, it's probably been done before. The site's been around 11 years. tl;dr I don't see how this hurt us as a community much at all; anyone who's been around here long enough didn't take it seriously in the slightest.
Though Softspeak does have a point; this is most likely connected to some member that was banned and is trying to ban dodge. Unless the admins didn't bother with an IP ban, I don't know how they're getting in unless they found a workaround. There's also an abundance of salty kids running around lately, which may explain something :V