It is promotional spam.
But given the volume of LLM slop, it was kind of obvious and known that even the moderators now have "favourites" over guidelines.
> Please don't use HN primarily for promotion. It's ok to post your own stuff part of the time, but the primary use of the site should be for curiosity. [0]
The blog itself is clearly used as promotion all the time when the original source(s) are buried deep in the post and almost all of the links link back to his own posts.
This is now a first on HN and a new low for moderators and as admitted have regular promotional favourites on the top of HN.