Their founder and current superior-general, Father Louis-Marie de Blignières, does not forget that these solemn commitment by the Holy See was made, and that thousands of men and women gave up their lives in the world because of this promise. It is not something that can simply be taken back from one day to the other. It is a not a joke. It is not a whim. It is a legal obligation that cannot be changed from one pope to the other, as it was made by the Holy See, not by Pope X, Y, or Z.
Their Christmas letter to the faithful is a most important declaration:
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A Christmas Message from the Prior:
On the Subject of the Motu Proprio
O Emmanuel!
December 23, 2021
Christmas Message
Dear friends,
In fervent expectation of the Savior, I feel the need to speak to you about a subject that concerns us all. I will do so with words that come from the heart of a priest who has celebrated the traditional Mass with deep joy for more than forty-four years.
The Motu proprio Traditionis custodes of July 16, 2021, and the Responsa ad dubia of the Congregation for Divine Worship of December 18, 2021, raises a question for us: should the Institutes of Ecclesia Dei adopt, as they are invited to do, the celebration of the Mass and the sacraments according to the missal and rituals of Paul VI? In other words, should these Institutes begin a process of abandoning the liturgical books that predate the 1969 reform?