Undercutting Vatican II to Defend Vatican II?

Archbishop Arthur Roche, prefect of the Vatican's Congregation for Divine Worship, recently sent the world's bishops instructions regulating local usage of the Traditional Latin Mass. Those instructions were intended to implement Pope Francis's 2021 motu proprio, Traditionis Custodes (Guardians of the Tradition), which strictly limited the celebration of Mass according to the 1962 Roman Missal. Traditionis Custodes presented itself as a defense of the authority and integrity of the Second Vatican Council -- which, it was claimed, was under assault from liturgical traditionalists. In several interviews, Archbishop Roche has emphasized that defending the Council was the rationale for both Traditionis Custodes and his congregation's detailed regulations. It is worth asking, however, whether Archbishop Roche's instructions drastically undercut one of Vatican II's principal achievements, which was to emphasize and revitalize the authority of the local bishop.