I wouldn't be at all surprised if this IS using project naphta behind the scene. Since it's pretty much the only open source solution that does this in js. Wrapping this in a pay for play service and not providing a github to the HN community, meh.
It isn't. ANd as mentioned in the blog post, we want to discuss how it works in the next post and open source as much as we can. We're built on open-source stuff after all. :)