It's insane how arrogant people can be about this. You have not accounted for all of the variables and that is blatantly obvious. The phenomenon is well known and there are multi-variable equations for it, many different models. One popular model is that NEET can decrease below the caloric deficit, meaning you still gain weight by becoming subconsciously lazier despite everything feeling equally difficult subjectively. There are several other more advanced models adding other variables, some depending on insulin sensitivity, for example. Anyway, no physics is broken, laymen are just naive to the complexity abd adaptability of biology.