I used to occasionally throw the JRT I used to walk into the water if she had rolled into something smelly or was exceptionally muddy. She was a few years old and hated swimming and there was no way I was going to be able to change that (the dog had some issues, I had to choose my battles). But I also wasn't going to let her in the car in her smelly state. I would describe her reaction as "indignant". Not aggressive or fearful and she would go in for a paddle (always only getting her feet wet) afterwards without any problem.
But I wouldn't do it if I was hoping for the dog to develop a love of swimming. I have been tempted to push my dog into the water on a hot day, but have been able to control myself. She occasionally swims but then the next time we go to the pond, she'll barely want to dip her toes in. And I definitely wouldn't throw a pup in from such a great height.
It used to be how people taught their kids to swim: just throw them in the deep end! I know a couple of older people who learnt to swim like that. They never forget the experience though.