Thinking deeper, it seems prudent that we tag submissions like this with a prefix. Example: "LLM: ". This would be similar to "Show HN: ". While we cannot control what the original sources choose to disclose, we can fill that gap ourselves.

My point: I agree with you: It is misleading that the blog post does not include a preface explaining it was written by an LLM (and ideally, the author's motivation to use an LLM). However, it is still a good blog post that has generated some thoughtful discussion on HN.