In Archaeologism Part I, I demonstrated that Popes from 1786 to 1947 condemned the heretics projecting Protestant notions of liturgy onto the early Church under pretext of "archeology" or "Church history."  This modernist fad is also called "antiquarianism." Realize first that Pope Pius XII basically warned the faithful not to believe the Holy Spirit was less active in guiding the Church of the Middle Ages than the Church of the Primitive Ages.  Secondly, he wanted us to realize the Holy Spirit does not change His directives in liturgy or doctrine. But on top of this,  I personally believe the modernists executing "archaeologism" (saying the early Church had no complex rites, [...]

Before looking at the Synod of Pistoia, let's define Archaeologism (also called antiquarianism.)  Unam Sanctam defines it: Archaeologism is not so much a heresy as a fad, a certain approach to Catholic liturgy and practice. Its distinguishing characteristic is an excessive value placed on those Catholic practices which came earlier in historical-chronological succession. For the archaeologist, first is always best. A practice or prayer of the patristic Church is “better” or “purer” than a practice of the medieval Church. Consequently, the goal of any true liturgical renewal ought to be to return to the practice of the first Christians, inasmuch as possible. The modern Church ought to imitate the apostolic [...]