Rome officially disavows that she provides new public revelation, but which means that she can "infallibly" assert that a 1st century event for which there is no testimony in Scripture or in the earliest centuries did occur and which demands assent of faith. Which is justified under the premise that Rome can "remember" what history "forgot." Thus nothing "new" means that post-apostolic beliefs were really old, under the new and novel premise of ensured perpetual magisterial infallibility as per Rome (and basically in primary cults).
For whatever is worth, a similar picture is seen in what we know as Rabbinical Judaism, where the extra-scriptural Torah tradition is sometimes taken to the point of rendering the scriptural underpinning unrecognizable.
Been there, done that, I’d never have to have darkened the door of a church if that was all I needed.