Why are you repeatedly stating that the post is an ad as if it is some sort of dunk? Companies have blogs. Tech blogs often produce useful content. It is possible that an ad can both successfully promote the company and be useful to engineers. I find the Fly blog to be particularly well-written and thoughtful; it's taught me a good deal about Wireguard, for instance.
And that sounds fine, but Wireguard is not an overhyped industry promising huge gains in the future to investors and to developers jumping on a bandwagon who can find problems for this solution.
I actually have built agents already in the past and this is my opinion. If you read the article the author says they want to hear the reasoning for disliking it, so this is mine, the only way to create a business is raising money and hoping somebody strikes gold with the shovel Im paying for.