I don’t think that punishing him is the right thing to do, because they should consider his age and instead of punishment they should provide him counselling to make sure that he understands what he did was wrong. Also if the same thing had happened with adult player’s then yea they would be banned, but I feel that he should escape major punishment as he’s young and mistakes can happen at this age.
But if they just send him to counselling, you also don't give the right signal in my eyes. Because it seems then that the ITF agrees with giving slaps to other people as there is no punishment for it.
They probably need to do both: ban him for a couple of weeks and give him counselling.