I don't know how I could have been clearer on this point. But a theologian might wish to propose to the hierarchy better ways to express even dogmatic teaching. That dogmatic teachings have limitations was made clear in the June 1973 Declaration of the Congregation for the Doctrine of the Faith, Mysterium Ecclesiae, which makes clear that definitions of doctrine are subject to a four-fold historical conditioning. Criticism does not mean the rejection of infallible teachings. It could, however, lead to disagreement with some non-infallible teachings.
Catholic theologians can legitimately disagree with some official non-infallible teachings.
Such disagreement, I would hope, would be rare, always respectful, and offered to other theologians and bishops rather than to the press in a news conference. It is difficult, however, for theologians to discuss such criticisms with one another, for example at an academic conference, without the media learning about it and immediately publishing it, usually in a sensationalized form. Again, I have written about all this more than a decade ago. Nor do I believe that Cardinal Ratzinger would have any problem with theologians discreetly and honestly talking amongst themselves about such deficiencies, always with a view to offering improvements and corrections for the sake of the larger Church and greater fidelity to the Gospel. I do not think so.