Play the weight-loss game with your body, and you'll find the goalposts get moved.
Presumably the point at which it's VERY difficult to expend more calories than you're consuming is something of an equilibrium point, or healthy weight. I find it hard to believe that if you're still 100 pounds overweight after having lost say 20 pounds that it's nigh-impossible to find more "fat to trim" in the caloric intake, for example.
It’s effectively pseudoscience in the context of these discussions.
The simple fact you use less calories to move less mass is far more of a consequential variable many people forget to account for.
Go for a walk wearing a 100lb weighted vest and the try it without one and the impact will be exceedingly clear.