I'm fairly confident they let it write the blog post too.

"Not as a proof of concept. Not for a side project with three users. A real store" - suggestion for human writers, don't use "not X, not Y" - it carries that LLM smell whether or not you used an LLM.

And that's just the opening paragraph, the full text is rounded off with:

"The constraint is real: one server, and careful deploy pacing."

Another strong LLM smell, "The <X> is real", nicely bookends an obviously generated blog-post.

You're absolutely right, this was an AI post