The author is earnest and well-meaning, but I was put off by the click-bait-style title of the book which turns out not to be correct. He took several years to memorise the Qur'an, as he explains in the pages that followed.
Nevertheless, this wasn't a bad book per se. There are some interesting insights, though I wish he had provided a lot more detail. Most of the nuts and bolts that he presents in the book relate to revision -- i.e. AFTER you've memorised things. He talks in this book about another book which is forthcoming, and suggests that those details will be available there.
So if you're short on time, you can skip this book and maybe wait until his next book comes out.