I've just spent too much time with different LLMs, and for example Claude really loves such bullet point lists. The article is full of them.

The whole structure with numbered sections really gives it away, humans don't write blog posts like that.

I remember reading the post and feeling it was inorganic.

After your comment I re-read everything and you're correct: this is a very common template for Claude type answers.

LLM-generated comments on HN are against the guidelines. Would the same apply to blog post submissions?

Well if it applied, someone should train a model that tells LLM and human content apart for automated rejection.

Easy peasy.