I thought the piece sounded like AI as well, so I ran it through Pangram, which reports it as 100% AI. Considering Pangram's extremely low false positive rate, I'm inclined to believe this was AI written.
Pangram does not report this as 100% LLM generated. Why do I use the word "touched" - because there are some specific details that must have come from some existing text and are not elsewhere.
How did I do the check? Please do check my results! I copied just the authored prose from the page, carefully removing any comments and site text that got mixed in. I did not have it analyze the "URL".
In looking at the details, a large part of the story is flagged as all human generated.
I've personally used LLMs when I've been very upset. I used it to rewrite / edit my rant into something with a more balanced tone. The modified text got what I wanted, my original rant would almost certainly not have.
So I do think this was a thought out piece that was largely written by a human who used an LLM as an "editor" to polish the writing. Someone took time to think about this and write it.
Some people say that AI is glorified spellchecker and then they complain when it’s used like a glorified spellchecker.