I generally distrust Reddit threads, but it's entirely plausible to me. I was once gifted a cookbook on Amazon that was full of pre-LLM "sludge" of suspect internet-collected recipes along with a stock photo of an author with fake credentials (her author page is still up, although her books have been pulled and apparently she's a man now https://www.amazon.com/stores/author/B0716Q2Y4Z/about)

When I left a negative review pointing out that the author was a stock photo (entire content: "The author of this book is a fraud. There is no Tina B. Baker, she is a stock photo."), Amazon pulled the review saying it violated their guidelines.