When pope Pius V established the Mass, he was merely canonizing a tradition. He was fixing something and making it irrevocable and unchangeable after centuries of development.
It *should* go without saying, but Quo Primum specifically mentions that it is codifying the Mass, which goes back to Pope St Gregory the Great (400s), who codified it directly from Apostolic sources (i.e. Christ). So Quo Primum explicitly states it is NOT creating a new rite, but simply making the Divine, Apostolic rite uniform, after centuries of human enhancements. Divine origin + human/church additions = a Traditional, Apostolic, unchangeable rite.
“58. It follows from this that the Sovereign Pontiff alone enjoys the right to recognize and establish any practice touching the worship of God, to introduce and approve new rites, as also to modify those he judges to require modification.[50]”

One of the most mis-quoted, taken-out-of-context quotes in post-V2 history. It must be read in context of the entire docuмent, specifically Pt 50.
50. The sacred liturgy does, in fact, include divine as well as human elements. The former, instituted as they have been by God, cannot be changed in any way by men. But the human components admit of various modifications, as the needs of the age, circuмstance and the good of souls may require, and as the ecclesiastical hierarchy, under guidance of the Holy Spirit, may have authorized. This will explain the marvelous variety of Eastern and Western rites.When Paul VI invented his new mess, he changed the words of consecration, which are undoubtedly of Divine origin. Thus, by this fact alone, the whole rite should be rejected, as Pius XII says above.