The author did a good job of outlining what worked for him. I also lost about 40 lbs over the last year (from 190lbs down to 150 now, which is a good weight for me). I've held around 150-152 for the last 3 months or so and feel great.
For me, it's less about the diet and more about the exercise. For me the key was making my health my own #1 priority. I had to make time for myself to go the gym. I had to stop putting work, or spending time with my significant other/family/friends/pets ahead of my gym schedule. I also learned to stop depending on others - having a gym buddy or going to class with a friend is great, but at the end of the day you need to go whether they do or don't.
Yes, I watched what I ate, and yes, I looked at the calorie counts to roughly budget, but I never kept logs of how many calories I was eating over a week. I'd just weigh myself once in a while to ensure I was still progressing. For me, I found the more I exercised, the more I naturally wanted healthier foods. Something like a donut or a dessert seemed revolting after spending a couple hours cycling. As with his calorie intake needing to be reduced has he progressed, if you keep working out, your ability to burn more calories increases along with your stamina. I can easily knock out 800 calories in a spin class now.
Find healthy foods and forms of exercise that you actually enjoy so you can keep the weight off. My breakfast/snack of choice is now greek yogurt, and I've found that I have a great time taking group fitness classes.