Your hopes will be in vain, Texana! It is custom throughout all the seminaries of the SSPX and was established by Archbishop Lefebvre. I know it was certainly in use in France before the Council. Wikipedia says Rome first approved it in 1922. We'd best not let that debate derail this thread...
Yes, it passed for "traditional" simply because the experimental dialogue Masses (hatched clandestinely in secrecy in monastic modernist liturgical congresses, under the protection of modernist bishops who came out of hiding in the wake of the death of Pope St. Pius X and the suppression of the Sodalitium Pianum) pre-dated the council. Of course, its principles are thoroughly modernist, and more developed, are found in the Novus Ordo (e.g., extending banter between priest and faithful; extending the liturgical action beyond the sanctuary; blurring the distinction between the ministerial priesthood and the priesthood of the faithful; assigning to the faithful a liturgical function; etc, etc).
It was always an incoherent experience to be learning in Liturgy I class the subversive nature, agenda, and methods of the modernist liturgists promoting the dialogue Mass, but then saying the dialogue Mass every Saturday (as though we were supposed to disconnect our intellectual formation from our liturgical formation). Weird.
+Lefebvre did not grasp that the dialogue Mass was the first step to the complete overhaul of the Roman rite (Just as +Vigano says of Pius XII and the modified Holy Week/Pentecost). It set the table for tinkering, the 1951-1955 changes to Holy Week/Pentecost, and finally the Novus Ordo.