Ask HN: Does anyone have any information on "JS-Blogger-Client: inserted post"

I noticed this morning in one of my feeds that comes from Blogger, a new post called "JS-Blogger-Client: inserted post". I went to follow the link and it was gone. Since it sounded like a cool "project" I searched for "JS-Blogger-Client" and was given a slew of results all from blogger blogs.

After a little research, it looks like the person who was able to post the message across all of the blogger sites was a webmaster at Google. It's obviously just a screwup that shouldn't have happened but I'm genuinely curious about what exactly DID happen.