I suspect his book will have been a rush job, just like the "coming out" episode of This Morning was.
Just like they tried to make the show look like a planned special, he is trying to make it look like the book was already in the pipeline to coincide with his planned coming out announcement.
Except it wasn't planned. It was forced.
Hes trying to use the book to make it look like he wasnt forced to come out before he was ready in order to halt the publication of whatever the newspaper story was going to make public.
See everyone, I was always going to come out and here's a book to prove it.
A lightweight book like that would only take an experience/professional writer a short time to write.
Sadly for him, an awful lot of people have sussed out this little manoeuvre.
Having said that, there's still a lot who will buy it as a Christmas present for someone.