I think there’s a good chance it was ghost written by a content farm for someone who wanted to publish a book in a popular category to make a quick buck. I recently learned that this is a soft-scam technique advocated for by a couple of guys called the Mikkelson Twins. They say you can make money by publishing audiobooks on audible by finding a popular topic on audible, then hiring a ghost writing service to write your book, then hire a voice actor to record it, publish it on audible, and then you too can become fabulously wealthy as the Mikkelson Twins claim to be. Except what the Mikkelson Twins actually make money on is selling you on a “money making course” where they tell you to do the above. So there’s all kinds of people trying to follow this method out there, it seems.
This excellent video [1] from Dan Olson at Folding Ideas is in my opinion a fascinating deep dive in to this whole scam. I don’t want to spoil everything in the video, but Dan does an exceptional job exploring how this ghost writing works, and why it produces the kind of nonsense writing that looks like GPT-3 but is actually being done by an overworked human who is trying to write an entire novel in three weeks or so on a topic they haven’t had time to properly research.