I'm gonna guess that embedding user IDs in the HTML of the site was the brainchild of Henri Watson. Whoever the infiltrators were picked up on that right away, and instead of just deleting the info, instead changed it to the ID of another user, who was then banned.
This is actually a pretty good illustration of Henri's juvenile bullshit: he gets about 20% of this stuff right. I guess if you're trying to identify leaks, then yes, you put identifying info in the leaks, but Christ man, you don't not only make the information obvious but also falsifiable.
Like I said, the kid just repeats shit he reads on the Internet without any understanding of it whatsoever. Sometimes it's just harmless and annoying, and other times, like this, it results not only in failure but in additional undesired things happening.