I've read this and I've seen the site, and I still have no idea what it is, what's the application and why should I be interested.
Additionally I've tried earlier chapters and they are behind a paywall.
You need a better introduction.
It seems that pretty much everybody here is confused by this article. One user even accused it of LLM plagiarism, which is pretty telling in my opinion.
I for one have no clue what anything I read in there is supposed to mean. Emulating a GPU's semantics on a CPU is a topic which I thought I had a decent grasp on, but everything from the stated goals at the top of this article to the example code makes no sense to me.