Twisty cats are born with forelegs which are not right (shortened, twisted or absent radius and ulna of the forelimb). The condition is called radial hypoplasia. This lady has filmed her rescue twisty cat, Atlas, in the back of her stationary car.
Twisty cats develop a strong use of their backs and hind legs to compensate. As you can see they stand on their hind legs somewhat like kangaroos to give themselves a higher viewpoint. The media have dubbed them “kangaroo cats”. I think this is unkind.
Understandably, Atlas looks anxious but he also looks very cute. He seems to rub his forelegs against his side in his anxiety. You want to give him a cuddle.
There is a page on PoC about a cat breed called the Squitten. Someone created a breed from this genetic mutation. As I recall the project was a failure and rightly so. People see the wrong in doing that.
The video is on Reddit uploaded, I believe, by user gDisasters.