Therefore, it's not ecuмenical.
Whether or not a Council decides to issue a solemn definition, the understanding of the Church has always been that when a moral universality of the bishops (i.e. nearly all of them) get together and teach in union with the Pope, that the teaching is protected from any substantial grave error by the Holy Spirit.
R&R completely dismiss or ignore that the Magsiterium OVERALL is guided and protected by the Holy Spirit. That doesn't mean there can't be a slight error here or there, but nothing substantial that would ever endanger souls or the faith.
From the CE article cited earlier:
The infallibility proper to the pope is not, however, the only formal adequate ground of the council's infallibility. The Divine constitution of the Church and the promises of Divine assistance made by her Founder, guarantee her inerrancy, in matters pertaining to faith and morals, independently of the pope's infallibility: a fallible pope supporting, and supported by, a council, would still pronounce infallible decisions.
It's because of the overall "promises of Divine assitance made by her Founder" to the Church that a legitimate Ecuмenical Council is not capable of practically destroying the Church. It's because of the indefectiblity of the Church.
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