it actually is from a booklet, not his book. apparently from the same publisher. i think from the layout and info in it, to me it looked like it was from one of the inside covers off a book jacket.
you can see the picture and full image here:
It’s called the “Sell Sheet”. It’s what the author puts together to market himself & his work. It’s supposed to pique the interest of publishers who read it, and make them want to see the author’s work and acquire it if possible.