I've seen people justify this saying that it might be an app running on Google App Engine.
I wonder though if the GAE data center (or part of it) is in Google HQ.
Moreover, as someone (EDIT: the article's author) mentioned in the comments of the article When an IP address registered to Google HQ's internal network is fed a unique phone number, and one hour later that phone number rings from someone who claims to represent Google, and repeats fraudulent claims that have been made for months from entities selling a Google product (that has no affiliate program), it is reasonable to infer that this is taking place with Google's cooperation.
Which is indeed suspect.
EDIT: as this comment below shows, it cannot be GAE: http://news.ycombinator.com/item?id=3460663