Some very interesting reading there.
Mr. Magister notes that
In his commentary, [Prof. Eberhard] Schockenhoff correctly writes that the real disagreement between the Church of Rome and the Lefebvrists does not concern the Mass in Latin, but the teaching of Vatican II, especially on ecclesiology and on freedom of conscience and religion.
Mr. Magister goes on:
But [Prof. Schockenhoff] also writes that Rome is wrong to whip up restrictive interpretations of the conciliar texts to offer to the Lefebvrists in the hope that these will be accepted by them. Because in Schockenhoff's view, this is exactly what is happening in the closed-door meetings organized by "Ecclesia Dei."
Fr. Zuhlsdorf says in his post that
It seems to me that if a basic foundation of a common interpretation can be formed between the Holy See and the SSPX, then the issue of religious liberty shouldn’t have to be a deal breaker.
As for the extract from the (rightly or wrongly) celebrated 'hermeneutic of continuity' speech by the Holy Father which Mr. Magister appends to his article, see my comment here.