That someone would agree to publish this book, after actually reading it seems laughable. I think the author just hit Print on their computer and uploaded a few images on the internet.
If there was a stupid book by a stupid author, this is it. Like how bad do you have to be that apparently, even the victim's family criticized it.
Anyways, it seems like the author subbed a few YouTube channels, screenshot the images, downloaded the transcripts, threw it in the air, and compiled it in a book. And for the seal of authenticity, even met the criminal, but then did nothing about it in the book.