I used this example because I think in most people's opinion using sockpuppet accounts in a comment thread is even worse than using them to upvote stories. It's not uncommon for people to try creating sockpuppet accounts to upvote their posts, but rare for people to resort to this.
I was able to infer the two accounts were the same person because, as I said, the changelog guys emailed me and told me so. I notice you don't deny it, which seems both revealing and revealingly disingenuous.
(Incidentally, if anyone is reading this far, this sort of thing is why it sucks to run a forum.)