The expressions "Gregorian Mass" (Messe Grégorienne) and "Gregorian Rite" (Rite Grégorien) have been extensively used as alternative names for the Traditional Latin Mass and the Traditional Roman Rite in France for several years. Cardinal Castrillón's use of the second expression in English should not be construed as something extraordinary or filled with any mysterious meaning; he just chose to use it then.
In any event, "Gregorian Mass" should not be confused with the ancient and beautiful practice of the Gregorian Masses.
In any event, "Gregorian Mass" should not be confused with the ancient and beautiful practice of the Gregorian Masses.