No, you read things, SFD, and think you’re qualified to make dramatic pronouncements on what you read. “Infallibility” is far less inclusive than you would have us think, especially in the truly surreal world of Pauline liturgy pronouncements, where a liturgy was OFFICIALLY PROMULGATED that read Pater, tu us solus Deus…only to have to be hastily withdrawn and rewritten (these things can happen with fabricated liturgies the pope entrusts to committees).
Everything the Church does bears **some **relationship to faith and morals, and the liturgy is surely a wonderful example of this. Nonetheless, the liturgy itself is neither more nor less than the particular form of the public worship of the Church as directed by proper authority in a particular time and place. The liturgical directives in force at any given time may tend to illuminate or obscure the fundamental mysteries which the liturgy enshrines, according to the wisdom and prudence (or lack thereof) of the competent authority (usually the Holy See). But liturgical directives remain human laws about how to do things, not definitions of faith and morals. As such, liturgical directives are not protected by the Holy Spirit in the same way that definitions of Faith are.
To put this another way, liturgical directives are matters of policy that affect the Faith, but not matters of Faith themselves. There is no guarantee of infallibility for Church policy. This in no way implies that liturgical directives are “unimportant”. They just aren’t matters of faith in and of themselves; they can, in fact, be good, bad or indifferent.
A moment’s reflection bears this out, for if they were matters of faith, then they would have to be, like the Faith itself, the same in all times.