It seems to have reached the front page too quickly, it landed directly at the 6th position when it had only a score of 3: http://hnrankings.info/26777008/, which drove it to the top.
I guess it's an aberration of the HN ranking algorithm.
> Please don't post insinuations about astroturfing, shilling, brigading, foreign agents and the like. It degrades discussion and is usually mistaken. If you're worried about abuse, email hn@ycombinator.com and we'll look at the data.
And for my sibling comment:
> If you flag, please don't also comment that you did.
HN is dead quiet around now. 2:30am on the West Coast. A few dozen upvotes will put a submission at the top. I don't think it's necessarily a conspiracy.