A startup with little brand recognition posts a blog entry concerning a topic of general interest to a demographic whose attention it seeks. A predictable discussion emerges with the company as a backdrop. Everyone rejoices that the topic has been broached, because they have well-informed, unique opinions to offer on the subject. Brand recognition is achieved, and because of the photographs of smiling, laid-back young people contained in the blog entry, the impression on the target demographic is a positive one. Everyone forgets it happened, and the cycle repeats again next week.
I don't know. I've never heard of it and I read HN daily. Maybe it's because startups don't interest me. Either way, I just think it's funny how these topics, which people clearly want to discuss regardless of what the Buffers of the world are doing, always have to be centered on a company's PR.
For what it's worth, you're not the only one. I read HN for technology oriented news and interesting articles and because I live in Silicon Valley part of the year. I've never worked for a startup and probably never will and I've never heard of Buffer.