This video, was filmed in Canada, as you can see the Cat is sitting on top of the toilet seat, apparently, this is the exactly what the cat owner’s want him to do, like he was trained.
If you want to train your cat to use the toilet, al you have to do is. just place a laminated sheet (cardboard) under the seat, with some flush-able litter,.
“Make a small hole in the middle (not too small), expand the size of the hole and make it bigger every week. Eventually, they get used to using the toilet.”