The Catholic Church cannot promulgate a New Liturgy that embodies ambiguity and professes false ecuмenism and Protestant theological quirks on liturgical manners.
Like dogma, liturgical laws in the Church are infallible. They cannot be contrary to Faith or cause the faithful to sin while simultaneously obeying the law. If the Church were to enforce liturgical laws or liturgies harmful to the True Faith, then the gates of Hell have prevailed against the Church.
Since Our Lord promised that Hell could never envelope Our Church, the logical reasoning is that the men who made these laws or the New Mass were either not Catholic or have fallen into heresy or apostasy. If men from the Church fall away from the True Faith, particularly if they're clerics, they automatically forfeit their office. In the Canon Law, promulgated by St. Pius X, public declaration would not be necessary.