|Le Barroux, 1995|
source: Una Voce, Venice
On the whole it seems extraordinarily unlikely. Joseph Ratzinger was a reformed theologian and "Vatican II man" through and through; his Introduction to Christianity would have had him before the Inquisition in the days of S. Pius V. Ratzinger, however, favored organic liturgical development and also had some modicum of compassion for traditionalists after he botched negotiations with the FSSPX and Archbishop Lefebvre died under canonical interdict. If anything his description of the Pauline Mass as a "banal fabrication" suggests he wished something less mediocre evolved through the traditional means of changing the liturgy, but he still wanted a different liturgy.
His interest in the welfare of traditionalists and in the [impossibly post-Modern concept of] hermeneutic of continuity may have motivated his half dozen or so celebrations of the 1962 missal prior to his papal election, among them with the nascent FSSP, a conference at Fontgambault, at the monastery of Le Barroux, and a few times for diocesan seminarians in Weimar.
Francis is the modern antidote to Ultramontanism, so why weaponize a past papacy?