Do you not believe in the existence of genius, or that people vary in intelligence? If not, why do you doubt his intelligence? Terrence Tao is an example of a child prodigy who became a famous mathematician, although I would say winning gold in the International Mathematics Olympiad is a more objective standard than admission to Cornell.
My take is that there are those child prodigies making great scientific progress but we don't hear about them because they want to keep their past private.
Although I agree the quotes kinda give a doubtful vibe to the child's prodigy, which I definitely disagree with.
Most of the few child prodigies that I am aware of haven't done that.
But I don't begrudge him the chance to get ahead if that's what he wants. Starting early means more time to change direction later. Missing a childhood, well, one person's idyllic childhood is another's vision of hell so let's not all judge too harshly.