Huh. This dude used Litter Kwitter, and has video of the cat actually using the toilet with it. And video of the cat pooping on the seat, and video of the cat drinking from the toilet, and video of the cat almost falling in while trying to do it without the Litter Kwitter in place. Oddly, there's video of the cat doing everything but successfully using the toilet without the device.
Nevertheless, given that I thought intially that this was an April Fool's joke in May, it is interesting. I do wonder how many come home to find that their cat has slid off the seat and is now swimming in the toilet, however. The last clip of the cat trying not to slide off the painted wood seat was a bit telling, I think.