That's a bizarre question. Luu's blog post is about longform primary content: blog posts, YouTube videos, and long Twitter threads. HN comments are neither long

That's a bizarre question. Luu's blog post is about longform primary content: blog posts, YouTube videos, and long Twitter threads. HN comments are neither longform nor primary. In this case, Luu's blog post is the longform primary content, and these HN comments are short, secondary content. I don't actually delete all of my social media posts. The point about deletion was to emphasize that they are fleeting thoughts. The crucial distinction is between spur-of-the-moment hot takes and carefully crafted, researched essays.