Come on, it's 100% gen. You know it's 100% gen.
Follow your gut and it'll serve you well. The moment you see a gen case and datewheel, you can be certain that the movement is gen. The only question is the dial. Is it a redial to make it more valuable? In this case, no, because everything else fits together so well.
Besides, if the case is gen and the movement is gen, it can have an UbiAriner dial and still be counted as gen, even if it's not a real red Sub.
Not that this isn't a real red Sub, of course. You know it's a real red Sub.