When a Nuncio speaks publicly, it is safe to say that we are hearing the sentiments of the Holy Father himself.
An Apostolic Nuncio functions as an ambassador representing the Pope in countries that have diplomatic relations with the Holy See. In certain countries the Apostolic Nuncio is de facto the Dean of the Diplomatic Corps. For instance, Archbishop Charles Brown of our own archdiocese, who is a friend of our parish, has that role in Ireland. A Nuncio must be circumspect in speech without compromising the Church‘s integrity. When a Nuncio speaks publicly, it is safe to say that we are hearing the sentiments of the Holy Father himself.
The Vatican has been engaged in foreign diplomacy longer than any other institution in the world, and it knows from long experience how to press points with subtlety, so when a Nuncio uses strong words, the situation he is addressing must be of serious moment.