He's making a point that authoring a book is not as hard as some make it seem. Many books are just rehashes of someone else's work. He's got the right idea but probably needs a bit of refinement. Keep in mind that it's 20 hours worth of work.

What he's lacking is marketing to make some cash. I guess this posts counts as a start.

Here's a link to one that's a bit more refined but it's basically the same type of book.

https://www.amazon.com/Life-Hacks-Procedure-Simplifies-Frust...