CathInfo.com

"This is why it is to be feared that these Institutes will be asked to make some form of submission to the conciliar liturgy, for example by making the celebration of the Novus Ordo mandatory at least occasionally, as diocesan priests must already do. In this way, whoever makes use of the Motu Proprio will be constrained not only to an implicit acceptance of the reformed liturgy but also to a public acceptance of the new rite and its doctrinal mens. And whoever celebrates the two forms of the rite will find himself ipso facto discredited above all in his consistency, passing off his liturgical choices as a merely aesthetic – I would say almost choreographic – in fact, depriving him of any sort of critical judgment towards the Montinian Mass and the mens that gives it form: because he will find himself forced to celebrate that Mass.

This is a malicious and cunning operation, in which an authority that abuses its power delegitimizes those who oppose it, on the one hand by granting the ancient rite, but on the other hand making it a merely aesthetic question and obligating an insidious bi-ritualism and an even more insidious adherence to two opposing and contrasting doctrinal approaches. But how can a priest be asked to celebrate a venerable and holy rite in which he finds perfect coherence between doctrine, ceremony, and life at one moment, and at the next a falsified rite that winks at heretics and contemptibly keeps silent about what the other proudly proclaims?"

Commentary:

Archbishop Vigano does not seem to realize this is ALREADY (and for the last 20+ years!) the reality for those "approved" Institutes (FSSP, Campos, La Barroux, ICK, etc), via Protocol 1411/99:

"Simply put, in Protocol 1411/99 the Vatican has ordered that any priest, even one belonging to an institute enjoying the privilege of using the 1962 Roman Missal, may freely celebrate or concelebrate Mass using the revised Missal of 1970 with no impediment whatever, the will of their superiors notwithstanding. But the Vatican went further, mandating that FSSP priests must say the new Mass or concelebrate under some conditions."

http://www.latinmassmagazine.com/articles/articles_1999_fa_woods.html

Released exactly one year after his previous bσɱbshell letter (response to +Schneider) ... on my birthday.

I like how he refers to it as the Montinian Rite and how he calls out "Freemason Bugnini" for basically copying it from Cranmer.