I'm gonna bet $100 that this didn't really happen.
It seems so, and we see quite a lot of stories made up like that when starting a thread, maybe Op is a storyteller so his imagination is very high to make up stories that look real but in reality, are fictitious. But if that's true it's not a necessity to teach about Bitcoin to children, especially if we want to teach them what we want to tell them, that Bitcoin can be an investment tool, that Bitcoin is a digital currency that can be used globally for transactions even though at this time it's not completely global yet because there are still quite a limited number of merchants who accept it, so teaching kids isn't a must, I prefer youth or at least teenagers where they can catch more things, so that when we teach them they can apply their knowledge even if not in its entirety.
I don't care if this story is true or just fiction, but I agree with you that teaching kids bitcoin is unnecessary. Their age is to have fun and explore the outside world, not the time to teach them about finance or investing. I support and encourage bitcoin education for people, but as you said, we should teach them when they are teenagers or young adults. When they have enough basic knowledge of life, and it's time for them to be independent in everything, including finance, it's the right time to teach them about bitcoin and finance.