He definitely needs to be aware of his body comp, but not worry. So I agree.
Eat at maintenance level. High protein 1.5g/lb. Moderate carbs; somewhere in the 150-250g range, its hard to say what'll work purely by guessing. 25% fat.
You should not be eating a big surplus as your insulin sensitivity is likely horrible at this point.
Cut out ALL alcohol. Eat plenty of vegetables. And most importantly, force yourself to get much stronger. Do cardio.