I did not watch this on principle. It is simple child abuse. Concentrating on one aspect of a child is unhealthy, and doing so on TV is pure exploitation.
I have a very very bright 6 year old grandson, and his parents took the wise decision to send him to a village primary school, rather than an academic private school. The result is that he is well-balanced, popular, fun and lively, whilst at the same time pursuing investigations in encyclopaedias and on the internet that are far far above his age. His reading ability was that of an average adult about 2 years ago. he could just read anything that was put in front of him.
When we are at out local pub quiz we often say to each other that what we need is our GS there to put us right. He wandered into one of these quizzes once with his Dad and I was just chatting to him, when he said - you know that last question they asked? - well the answer is...... - and he was right!
His assessed levels in his school report are at least 4 years above his chronological age, but he fits into his class just fine. The other children are aware that he is a bit different and often ask him for facts or help with what they are doing - the teacher says that the other children look up to him and he is very popular and always ready to help others. He has learned social skills and is always up for rough and tumble. He is as far from a "boffin" as anyone could be.
What he is learning there is far more important than his outstanding intellectual skills - he is learning that he is simply a child among many others.
I can imagine that some parents would have "hot-housed" him, but I cannot think he would have been the same friendly little chap that he is.