I wouldnt say its abuse but i also dont think its a good idea.
As a bodybuilder i understand the stress the body is placed under when training and i dont feel its good for a childs growth,but infact bodybuilding is very good for bone density.
would this be an issue if "the dad" was out pushing him playing football everyday playing football games on a sunday? no because he wouldn't look like he does in that video.
He wouldnt need any "steds" to gain abs every human body has abs but most people tend to abuse there body's with excess food and alcohol and cover them up with inchs and inchs of fat!!!!
Fact is if people had a average level of bodyfat and took regular exercise they too could have abs and be able to hold there own body weight off the floor like he demonstates, the facts are more like most adults are lazy and dont have the dedication to even stick to exercising once a week.
Our bodies produce growth hormone until we are 21 so technically we are still growing till we hit 21.
This child has exceptional genetics to develop a body like he has, a child of a similar age who trained the same might not look half as developed as he does, or i might be totally wrong and his "dad" might give he "steds" for breakfast!!!!!