Failure to Exercise Episcopal Authority?

From the Archdiocese of Dublin:

In response to queries regarding an invitation to Rev. Charles Curran to be a speaker at a Conference to be held at Saint Patrick’s College Maynooth, on 28th and 29th April next, entitled “The Risks of Theology” the Archbishop of Dublin, in whose diocese Maynooth College is situated, notes that Rev. Charles Curran, while being a Roman Catholic Priest in good standing, has been declared by the Congregation for the Doctrine of the Faith as “not suitable and not eligible to exercise the functions of professor of Catholic theology”. The Archdiocese of Dublin has in no way been involved in the organization of the Conference.

Ends 24/04/06

Curran is a priest is good standing? Why? One wonders why the Archbishpo of Dublin would even permit this man to speak in his diocese? If he's not "eligible" to teach theology in a Catholic university (which he did for some 18 years at Cathlic University of America, to the dismay of faithful Catholics and, evidently, Pope John Paul II) what qualifies him to present his teaching in a diocesan setting?

Source.