Maybe, but what the article is really about is how these two people responded to being marked for greatness at a young age. I don't see a reason to disbelieve that part.
Then the article should be titled "being famous as a child is not enough". But then it would not be a very interesting article.
Also, it's not just "maybe" that neither of these people have exceptional IQ. It is more like "most certainly not, unless they have some strong proof, because they lied multiple times".
