Well, there used to not be Salvation outside Rome. Until there was. Even for Muslims.
Clear as mud.
I believe that to be the biggest difference between the conservative Catholics and the ultraconservative Catholics.
All Catholics believe that there is "no salvation outside of the Church" but one group believes that this means that for most people they have to be Catholic in order to be saved, while the other group believes that the existence of the Church and the graces that flow from God through it will allow even non-Catholics to be saved.
And with regard to the Catechism, it does not merely state "no salvation outside of the Church" and leave it to individuals to decide how to interpret it. What is meant is clearly defined. This definition appears to have changed especially since Vatican II and is a cause of much dissension.