possible. The muscular development isn't actually anything mind blowing, ive seen this kind of physique in kids that have actually been pushed hard in athletics their entire youth by overbearing parents, particularly in gymnasts.
its the stupendously low bodyfat and vascularity that looks a bit suspect. I for one wouldn't be telling my pubertal son to be doing 6 month long starvation cycles just to pop some veins for the 'gram.
Kid stands out now but if he has similar proportions when hes 20 he'll be an incel and no one will care.