Do you really believe this?
So if you put anyone on that stage on "TRT" (let say 150mg of T per week which is MORE than most need to be high normal) and had them train and eat the same the would not deflate after a year. Do you really believe this?
I should have said, "not JUST because they are off drugs."
Well, strictly speaking, I don't think he would "deflate", in the sense of losing weight, if he was eating the same. He'll probably get even heavier since he's not burning the calorics he did while in training. But there will be a dramatic difference in body composition. But I understand what you are saying.
Of course, you would lose a considerable amount of muscle mass if he just went on TRT. The whole point of AAS is to take you past your natural limits. But hormones alone is not going to do it. As in the example I gave, if two twins followed the exact same life style except one took hormones and didn't train, and the other trained but didn't take hormones, the trained twin would be more muscular.
Hormones alone isn't going to do much if you are not eating a caloric surplus and doing resistance training.
Mustafa is definitely not training in that before and after pic.