From the recording it looked like a rip from a video tape straight out of the 80s. To be honest I found it in the early 2000s on a now defunct torrent tracker when already all sales pages had gone and only some scam reports still existed. Had a super fluffy title something like 'write a book in 21 days guaranteed' but I gave it a chance because I was curious. It was actually just like OP described, only applied for non-fiction books. The author was really all about hacking an expert-looking book in the shortest time possible - without calling it hacking. The process started by reading the top 10 books in your field, then develop 25 core questions, fill each question with 5 sub questions, use a timer of 5 minutes to write against the clock the answer to that question. The idea was to get into a writing flow and stop reflecting while putting out as much text as possible. He sold the idea by the good old pareto logic, suggesting that by reading the top 10 books you already know more than 80% of the people interested in the topic, making the book good enough to be seen as the expert. In the end he suggested threwing out 10% of the worst paragraphs, then editing it all together and done is the book.