Gee, Quix... these are freverently defended all the time around this forum. About the most controversial is probably “there is no salvation outside the Catholic Church,” in which case the author of this list glosses over the caveats, probably in reaction to people making the caveats are the rule.
(Protestants *may* be saved through extraordinary grace if their rejection of Catholicism is due to “Indefatiguable ignorance.” “May” in this case refers to the condition that the Catholic Church cannot know, so rather places its hope in an all-loving God; it means it’s hypothetically possible, not as in “yes, you ‘may’ go to the front of the class.” “Indefatiguable ignorance” means that miseducation prevents an ardent soul from accepting the Catholic Church despite a fervent desire to obey Christ. It does not mean, “Well, I grew up Methodist, so I stayed Methodist. I think that many Catholics, even here, expect that “extraordinary” means “quite typical” rather than “outside of the ordinary.”)
I would say the most controversial is number 4; Even if you accept the concept of transubstantiation, it seems quite a leap from believing Christ has physically appeared on your lips in human form, to believing that the Mass itself mystically transports you to Calvary in a sacrifice equal to that of Calvary.
I’m not sure however that I’ve ever seen a Catholic argue that before, so it could well be that this assertion is contested even with the body of Catholic believers.