This is true, but fat people have a hell of a time cutting out all carbs. For many of them, they'll eat the "low carb" option, and then have an occasional binge and it negates any benifits of low carb, and doesn't put them in ketosis, etc.

I strictly maintain my weight. If I catch it going over over 155# (I'm a 5'10" 61 year3 old male) I'll do a strict cut. And I know that either strictly counting calores OR going to as close to zero carbs will have the same net effect.

But a person who has obesity or is overweight will not be able to follow a diet. They are just incapable of doing so, or will lie to themselves or others about it and claim it's their "metabolism" or a medical condition, etc.