Where exactly has he stated that no contradictions exist?
"The Second Vatican Council has not been treated as a part of the entire living Tradition of the Church, but as an end of Tradition, a new start from zero. The truth is that this particular council defined no dogma at all, and deliberately chose to remain on a modest level, as a merely pastoral council; and yet many treat it as though it had made itself into a sort of superdogma which takes away the importance of all the rest." ~ Cardinal Joseph Ratzinger, July 13, 1988, Santiago, Chile
"In view of the pastoral nature of the Council, it avoided any extraordinary statements of dogmas endowed with the note of infallibility, but it still provided its teaching with the authority of the Ordinary Magisterium which must be accepted with docility according to the mind of the Council concerning the nature and aims of each document." ~ Pope Paul VI, General Audience, 12 January 1966
Since the Council was pastoral, it reasonable to interpret the documents through a hermeneutic of continuity where continuity exists, while disregarding those points which depart from Tradition (and whose rotten fruits are becoming clearer over time).
I said “if”.