Right, I'd say that this post has more value than any of the repetitive content marketing these folks churned out for a few years, since it hopefully makes some HN readers a bit more aware that they're being played.
But the interesting question is: why did they write this article?
Is it just that the jig is up, and their one weird trick no longer works as well as it did? Did they get asked to cut it out by the HN moderators? It seems plausible given how many recent submissions to this domain appear to be auto-dead. Do they just think HN readers will forget about this article, and upvote their next bit of content marketing anyway?