His starting stats: 198 lbs, 17% body fat, 33.6 lbs in fat.
His final stats: 206 lbs, 10% body fat, 20.6 lbs in fat.
33.6-20.6=13 pounds lost in fat
206-198=8 pounds gained in total weight. If he just lost 13 pounds of fat without gaining any weight, he would weight 198-13=185 pounds. But he claims that he weight 206 pounds at the end. Which means he gained 21 pounds of muscle assuming his water weight has not changed.
This is impossible, even for beginners. He is trying to sell the idea that he somehow gained 21 pounds in muscle while losing 13 pounds in fat all within a month.
This video is a perfect example of youtube con artists. Either he lying about his stats or he is lying about how long it took him to make this transformation. And judging by his before and after pics, you can clearly tell that he didn't gain 21 pounds of muscle.