Mike, I didn't say it was that easy. Like everyhing mentioned in this thread, it needs practice.
Look below for two sitting sailors in turtle position:




They have the uphaul-line over the wrong bow. It should be just over the middle from the front-beam.

But even then it can be a hell of a job. Look below 4 men on a lake, no wind, flat water:




They also didn't quite understand the trick of pushing only one hull down and let the cat fall on its side.

So, the idea of Timbo: pulling the cat in stormy conditions on purpose in capsize position with the risk of turtle needs a few requirements:
You have to be sure that in case of turtle you can help yourself and you have to be sure the mast is watertight.

Mind you, if you put a ball in the mast (may be only in rough conditions), you don't have all these problems. With a ball in the top you don't come so easy in a turtle position, but if you do, you don't have to do anything.
Cat will right itself to 90 degrees.