A couple of weeks ago, there was a local News story about a “swimming teacher”, who uses this method.
She charges $200 per child. Basicly what she does, is sit on her ass barking orders, while her young assistants hurl screaming and wailing children into the pool. The children were mostly preschool age, but there were a few older and one baby less than a year old. One little boy, was in the pool with floaties, but he was the only one, (maybe you have to pay extra for it). The teacher said they have to learn that it’s up to them to keep from drowning.
The parents are permitted to sit and watch, but not allowed to comfort. A couple of moms interviewed that they thought it was the best thing ever. But some of the parents looked as traumatized as the kids, just not as vocal.