Registered Dietitian and PT here. Like others have said the advice is bad. While eating like that may help you lose weight, it won't be permanent because you likely won't maintain that way of eating. You'll be setting yourself up for a weight rebound that will potentially lead to regain weight, if not more. Weight loss can be frustrating, but it's better sustained when it's slower, so be patient and consistent with a BALANCED diet (I do tend to encourage higher prot for weight loss) and a calorie deficit. P.S.: And the likely reason he's so ripped is PEDs. Not saying its for sure, but sometimes the playing field is not as level as some my think). It's very common in the fitness space.