That's pretty much what the Latins say when they refer to "no salvation outside the Church". The Church understands that the Spirit blows where He wills, bringing into the "Church" even those who are outside the VISIBLE walls. Thus, the Church firmly believes that even a non-Christian can be saved by the Spirit. The sacrament of Baptism is the normative means of entering the Church. But it is certainly not the only way, as God is not bound by the Sacraments (so says St. Augustine). I think what we see is Rome defining more broadly what "Church" is. Vatican 2 made it clear that the Church of Christ SUBSISTS within the Roman Catholic Church, but never said it IS the Roman Catholic Church. Sort of takes me back to geometry and sets and subsets... What I found interesting is that ONLY APOSTOLIC communities are "churches" per sec. Thus, Rome sees the Orthodox as an Apostolic Church, despite our schism.
Regards
Isn't the idea of an "Invisible" Church basically a Protestant concept?