The WebProNews article quotes this Asiajin translation [asiajin.com] of Google Japan's apology for the incident...
Google Japan Apologizes For Inappropriate Pay Per Post Use
"Google Japan is running several promotional activities to let people know more about our products.
It turns out that using blogs on the part of the promotional activities violates Google’s search guidelines, so we have ended the promotion. We would like to apologize to the people concerned and to our users, and are making an effort to make our communications more transparent in order to prevent the recurrence of such an incident."