Thats where we got to the point that the author knows that there's not a lot of ex muslims and that if he writes something like "Quran is the word of God and Islam is the religion of peace" do you thing you were going to buy it?
I doubt it so that's why I was saying it's purely commercial and I think you mentioned it's not his first book so he's on win-win situation: He writes what most peaple want to read and he get a lot of money, isn't it all good
You see we have a lot of books (more than enough) depicting really Quran's verses and some of the authors saw their books burned when they released them and this is across 1400 years. There was even something called the "science of speaking" where the most famous matter was their debate if Quran was a creature or not.
This kind of debate leads to nowhere, in the end you need some faith to believe in something and if you have a strong faith in atheism then you are done with the subject.
The one and only truth is that humans need to believe in something: that's why in the history they had always something to believe in and it's still going on