That's your own opinion. The data book already stated that it isn't Madara's technique. You just have to be the original wielder of the Rin'negan, which Sasuke is. Sasuke almost certainly has it, he just has to learn to use it. And considering how fast Sasuke has learned to use the Rin'negan in Shippuden, I wouldn't put it past him to know it two years after. And using the movie as proof? It was already confirmed Sasuke only has like 50 seconds of screen time. That isn't enough to showcase anywhere near his full arsenal after training with the Rin'negan, so your point is moot.