To deny it is simply an argument from ignorance fallacy. It would be equivalent to saying that the 3rd hokage did not know all of Konoha's jutsu because he never showed feats of all the Jutsu's in Konoha.
Sasuke was nerfed and that's the only reason why Naruto won their last battle as rivals. If he was allowed to utilize the Rin'negan's full potential, Naruto would have lost without any shadow of a doubt.