That would bring a lot of badly targeted traffic. Sure, maybe better targeted than from a general interest site, but if your startup is targeting a specific profession, HN traffic is a drive-by, not exposure. Targeting is as valuable as raw traffic numbers, hence why Google is rich beyond the dreams of mortal men.

I think that the author's blog is separate from his company blog. Looks like he writes not only about SEO (which is what his product is built around), but startups, code, and general business.

I should have been more clear, I'm not referring to this blog - I'm referring to content like this on a company that sells cats' blog.