Drugs and hormones work.
He’s certainly grown huge. Of course, he won’t amount to squat in bodybuilding. I hope his goal was simply to (temporarily) become a massive muscle man and be a mildly (and soon-to-be forgotten) successful competitor.
He has done considerable damage to his biology in the pursuit.
If he is even remotely intelligent and forward-thinking, he will now get off the gear and allow his young body to recuperate as best it can.
P.S. That lower leg vein situation is ghastly.