As long as I've been reading HackerNews (all the way back since it was called StartupNews), it's been common to see founders chime in about their startups when they are clearly relevant to the topic and it's not done by a marketing drone posting on their behalf, and with a clear disclaimer.
Whether people gets downvoted or upvoted for it depends on whether readers see the comment as legitimate and relevant or as spam...
I don't think HN has any specific rules about self-promotion in comments, but their service seems relevant given all the extra features it offers in comparison to the blog post's suggested host of GH Pages.
Serious question, this post is nothing more than marketing blurb, contributes nothing to the discussion. What's the site policy?