I question whether the author believes what he's preaching, since he's taken the time to write this post, create a newsletter, add a sign up form and follow me on twitter plea, and then post it to Hacker News.
I've found that, generally, people who think audience-building is a waste of time don't spend their time audience-building.
What's so clever about this article in particular? It fits into the proven, "pessimistic take on a new trend" form of clickbait, published to an audience that loves pessimistic takes.
Hacker News is the perfect venue for this piece of content, since people here all wish they could just build something amazing and people would flock to it by default. The author is telling the crowd exactly what they want to hear, while ironically, building his own audience.
I would take this post with a grain of salt.