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I'm in the hermeneutic of continuity camp as an Indult Traditionalist. I believe most of the affirmations of Vatican II, which are not infallible, can be interpreted in light of Tradition. In the case of the sentence you mention, take the Protestant minister who baptizes a baby. That baby dies baptized and goes to Heaven. So did Christ choose to use the Protestant minister in giving salvation to that baby? Yes, it seems He did.

Any individual can baptize.  A Jew can baptize.  A pagan can baptize.  And yet Christ does not use their "churches" as means of salvation.  To say He does is heresy.

Xavier, let's also remember the major spiritual flaws of protestantism, all of which have contributed to V2 and our current social/religious chaos.
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1.  Protestants are not part of the Mystical Body of Christ and cannot help it, spiritually.
a.  They don't believe or pray to the "communion of the saints" so they deny the Church Triumphant.
b.  They don't believe or pray to the souls in purgatory, so they deny the Church Suffering.
c.  They don't believe or pray for the Church, so they deny the Church Militant.
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2.  Protestants deny Christ's true Kingship, therefore they worship a false Christ. 
a.  Protestants deny the Eucharist; they cannot pray to the true Christ.
b.  Protestants deny Christ's Mother and His Church; they cannot be his true followers.
c.  Protestants deny grace, the sacraments and the Mass; they cannot worship Christ as He wants and is deserved.
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3.  Protestants cannot actively (or properly) fight the Kingdom of Satan.
a.  Their "religion" is not supernatural at all; they only worship God on the natural level.
b.  They deny the necessity for any and all supernatural works; their only good deeds are natural charity to their neighbor.
c.  Thus, they are only capable of praying for natural things:  end to abortion, happy families, end of addictions, sins, etc.
d.  They cannot, in any way, truly fight satan or "the powers of darkness" on this earth, because their "religion's" purpose is purely natural.
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4.  Protestants contribute to wimpy Catholicism, by passively tempting Catholics to concentrate on natural goodness, or by the false notion of trying to please God through purely natural motives/means (i.e. non-catholic prayers for worldly desires).
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One could go on and on, detailing the vast list of protestant errors and how they multiply into even more vast spiritual problems.  Will some protestants eventually convert?  Yes, but due to God's grace and their good will, not because of their false "religion". 
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Protestantism is a scourge on humanity.  It creates divisions in society and leads to communism because
1) its errors lead to pride, each person being their own "interpretation" of scripture.
2) private interpretation leads to divisions, quarrels, and factions, a problem that will never be solved.
3) divisions and factions lead to an independence mindset, which destroys the catholic principle of community.
4) Independence in religion, leads to independence of thought, leads to independence of the natural law (i.e. sin).
5) Independence of natural law means a breakdown of order, the family and society.
6) A breakdown of society and family eventually leads to totalitarian govt, which arises to control a population that cannot control themselves (i.e. sinful people).