Yep, clearly LLM assisted writing. It was likely prompted in stages, not one shot with a single prompt. I'm surprised you are basically the only one to notice. It seems most people need to literally see "not X, but Y" or "You're absolutely right!" to recognize it. Interestingly, I think it's gotten to the point that those who don't use LLM's or engage with LLM output often are unable to detect it.
Ah yeah, it probably is. I noticed I guess the more subtle LLMisms earlier on. I stopped reading fairly early on when I noticed I was wasting my time reading a long AI slop article. I do admittedly read a fair amount of "AI slop", but I prefer to read the ones coming from my own prompt.
I started keeping my eyes open when the wrong season was given for the Bad Place spoiler (I see this was since corrected, and maybe the flow there was improved as well?). In the first sections the obvious tells were edited out (but the thinking still feels like AI), by its ends you have "The business was never aggregation, or saving, or hedging. The business is sucker farming: manufacturing a product whose counterparty is a retail customer who does not understand that he is the one being farmed. It could have played by the existing rules. It has decisively chosen not to.", and from there the frequency of LLMisms, uh, increases not linearly, but exponentially.