Catholic doctrine is immutable. What was true under Gregory XVI is true today. What was condemned by Pius IX cannot be enshrined fifty years later. In Christ’s Church, error does not become truth, nor is it imposed as doctrine.
Vatican II broke with that magisterium, not subtly, but directly.
And yet people refuse to see the obvious. Why? Because they have learned to love institutions, faces, sacraments, and names more than doctrine, more than the truth, more than Christ Himself.