[sinkspur]

Is this rule codified too?

I don't know. But, even the Tridentine Rite was a "new rite." Liturgical practice is not a matter of faith and morals, and rubrics cannot be defined infallibly.

[biblewonk]

So the pope that thought that he could dictate litergy to other popes was wrong?

[ultima ratio]

Wrong again. While liturgical rubrics may not be a matter of faith and morals, the liturgy itself most certainly is. Nothing could be more intimately connected to the faith than the way we worship God. The notion that the liturgy is exclusively a matter of discipline is another crackpot Novus Ordo notion designed to reduce legitimate criticism.