TheOptimizationIdiot - 4:03 pm on Apr 13, 2013 (gmt 0)
Maybe watching the Negative SEO video would help:
Also, if you've hired an SEO (the first thing he says in the quote above), that's not you doing it or confessing to anything except getting "taken" by someone who didn't do their job right and may have hosed you in the process.
So, what his statement that's posted verbatim actually says isn't about "confessing" to doing anything, expect somehow having links that look unnatural to your site. Much like in a negative SEO situation, his statement says it makes it easy to undo what you or someone else did.
They don't need you to report it or "tell on yourself", they already know the links, maybe better than many site owners. They're giving people a way to clear those links up regardless of who built them.
I doubt if they would ever rely on webmasters to "tell on themselves" or "do anything" except build a site, because it doesn't scale to every site on the web, and they like to do things that scale.