Benedict XVI's "heremeneutic of continuity" was in fact a Hegelian-dialectic-based form of modernism. You take Old Magisterium (thesis) and New Magisterium (antithesis) and then blend the two. He applied the same dialectic to the Liturgy. So what of Ratzinger's "hermeneutic of continuity" when he famously referred to the V2 being the equivalent of the French Revolution in the Church?
Also, Summorum was nothing but a clever sleight of hand. You see, with the Indult, the Tridentine Mass was forbidden except when permitted. With SP, it was permitted except when forbidden (due to the last out clause which allowed the bishops final say in the matter). It was just a trick to win over Traditionalists, a bait set for them to lure them into the V2 trap.