This particular author seems to be frustrated by some repetitive and minimizing comments from HN in past discussions of their work. Part of the discussion used to be people sharing that twitter threads are annoying and not discussing the contents. [1] And there was a pattern of a few HN comments minimizing past posts saying "it's nothing new" as well as twitter bot spam. [2]

Edit: They also posted further down: https://news.ycombinator.com/item?id=34634289

The original article can also be seen if you just go their tumblr homepage as they made a copy of it.

https://twitter.com/Foone/status/1440695609913053194

https://twitter.com/Foone/status/1310434318490034176

The original post is still viewable if you check the root URL

This appears to be a special message just for us.

You can also just scroll down a bit to find the original post. There is another (also interesting) post in between.