I imagine Malc was particularly referring to the drawing skills (yes?), Roger. Any pre-teen child displaying the writing skills required (as you say, honed by life's rich tapestry) would be beyond even the twilight zone that these miraculously gifted musical prodigies come from.
But even those kids that can draw to unusually high standards don't come close to the level of ability that the little girl in the clip showed. After 48 years, I wouldn't equate my own level of drawing skill to her musical ability.
I was mesmerised by that - not once did she consult the sheet music (assuming it was even the right sheet music), so it was done entirely from memory, using hands far smaller than the piece would have been designed for. For any child that age to be able to pick out an eight-minute classical tune on the piano from memory with one finger would be impressive enough. I don't understand the forces at play here, but they go way beyond anything you can accredit to teaching methods.
The best bit though, and the most reassuring, was around 4 minutes and 7 seconds when she finally hit a bum note (there may have been one at 3 minutes, 9 seconds, but I'm not a musician) - she grinned and continued. And at the end, after a suitable pause, she positively beamed for the split second the parent (I assume) allowed us to see it.
Over the decades, I've learned to hide my annoyance at people who have flippantly described whatever I use to plough my trade as a "God-given talent". It's not - it started out when I was very small as something I discovered would make people laugh and give me praise in return. I attached myself to it, developed it over the years, and am hopefully still improving on it today. My childhood cartoons were sufficiently better than my mates' efforts for me to stand out, but a million miles away from prodigy level. And my ability has grown with me, with hard work, study (of other artists and their techniques) and experimentation. I don't believe any of it is either natural or God-given.
These kids, on the other hand...