The post-conciliar novel view of orthodoxy is only right belief in Church doctrine, in particular what conciliar popes teach especially on issues like birth control, abortion, the Eucharist, or Mary. But traditionally orthodoxy also applies to praxis or Church practice, as to whether liturgical or pious practices are orthodox.
The post-conciliar novel way to think among “conservatives” is that as long as the pope or local bishop approves of a practice then, regardless of the practice itself, it therefore must be orthodox, that is being in conformity to Church teaching. This is why traditionalists object to the Novus Ordo as unorthodox, because while not being an explicit rejection of doctrine, in both its approved structure and common practice it is Protestant, and therefore tends to contradict Church teaching on the nature of the Mass.
Let’s bring back orthodoxy to what it is, to include orthopraxis, or correct worship or conduct, because that is part of what orthodoxy is. If orthodoxy means right belief, then we must have right belief about ecclesial actions. If I believe the Novus Ordo, even in the official missal, is not at all Protestant, then I lack right belief about what the practice of the Novus Ordo is, or that it can be accepted.
Also, orthodoxy involves not only dogmas, but a hierarchy of doctrines. There are doctrines at the very top, in the middle, and lower level doctrines. Examples of lower level doctrines include the constant prohibition of participating in illicit, invalid, heretical, or schismatic forms of worship, even in the name of ecumenism, or the traditional, pre-conciliar papal teachings condemning the modernist teaching on religious liberty.
Even if a pastoral Council (Vatican II) or pope gives a lower pastoral or disciplinary level document to be adhered to, if they contain error, then previous higher level documents (ex: doctrinal, not pastoral documents condemning religious liberty and condemning the ecumenical movement) take precedence and are the documents to which, according to right belief, we must adhere.
True orthodoxy refuses to accept doctrinal errors even if cloaked in authority, adhering to higher authoritative teachings. This is why in order to be truly orthodox, and therefore faithful to Christ and the Church, you must be a “traditionalist Catholic” today. Because this means being faithful to Tradition, both divine and ecclesiastical, and therefore orthodox in the full and true sense of what that means.