Some argue that Ordinatio Sacerdotalis is not infallible (in light of Pope Francis’ recent meeting with UISG). Is it? What makes it infallible or not? Thanks.
Dubium: Whether the teaching that the Church has no authority whatsoever to confer priestly ordination on women, which is presented in the Apostolic Letter Ordinatio Sacerdotalis to be held definitively, is to be understood as belonging to the deposit of faith.
This teaching requires definitive assent, since, founded on the written Word of God, and from the beginning constantly preserved and applied in the Tradition of the Church, it has been set forth infallibly by the ordinary and universal Magisterium (cf. Second Vatican Council, Dogmatic Constitution on the Church Lumen Gentium 25, 2). Thus, in the present circumstances, the Roman Pontiff, exercising his proper office of confirming the brethren (cf. Lk 22:32), has handed on this same teaching by a formal declaration, explicitly stating what is to be held always, everywhere, and by all, as belonging to the deposit of the faith.
However it is important to note that Ordinatio Sacerdotalis **only **refers to priestly ordination. It does not address the issue of deacons, which is what Pope Francis recently raised as a question.
For further reading:
International Theological Cmmission’s 2002 From the Diakonia of Christ to the Diakonia of the Apostles