I have to admit to having the same thought. Ottbmare posted more information right before your post. What I’ve noticed at pools: When young children learn to swim well enough, many parents seem to be lured into a false sense of security. Very sad.
There is no way a three-year-old could ever learn to swim well enough to be left unsupervised. No, not even in shallow water. And no, not even wearing a flotation device. Kids can just slip right out of life jackets and water wings.