I've never believed you need to eat when not hungry to get to a certain "points" number or calorie number or what have you. People have blown the starvation mode myth out of the water and it's over-used and poorly understood. When his body is hungry for more, it will let him know. For now, he should embrace the low appetite because I have gone through periods like that as well, and eventually, my appetite returned with a vengeance, as is the case with many people! I wish my appetite left never to return. No need to eat when not hungry. So counterproductive to every bad habit we are breaking ourselves of.
No more scales! I am taking the scenic route...