I think we all understand the concept, but how you are saying it is deceiving. As long as you stay in a caloric deficit AND have 1 gram of protein per pound, you can eat whatever you want. To stay in a caloric deficit without any cardio, what you can eat then becomes limited.
TA saying he eats cookies and pizza is probably not false, but he is eat 1 cookie or 1 slice of pizza. It is not like he is eating the whole pizza or a dozen cookies.
Regardless, you still have to watch what you eat and you will still be hungry in order to lower your bodyfat.