The paint in your video, Jennyjoan, is a 'wonder' all-in-one product that can (according to the manufacturer, at least) be used to paint just about everything. So it's exactly the same stuff that people use to paint their front doors, their cupboards and everything else.
My instinct would be to avoid such a product, as I'm always wary of something that is sold as a panacea for every type of problem.
Further, I find myself wondering why a company with such a 'fantastic' product only sells online and doesn't market its products through companies like Home Depot and Lowe's in the USA. (How many UK paint companies do you know who wouldn't offer their paints through B&Q or Homebase if they could? Something just doesn't seem right to me somehow).
So, if you're determined to go down the route of painting your leather sofa, my recommendation would be to go for the Angelus paint, which is marketed as a specialist product specifically for use on leather. (You can't buy the US stuff here anyway). Please don't blame me if it all goes wrong though!