Cera, unless ANYTHING published for Catholics pre-dates Vatican II, it simply cannot be taken at face value.
Even highly reliable, dedicated "super-conservative" and a handful of Trad publishers, editors and authors have made a few errors in the past 50 years.
NOT intentionally, NOT as part of a "secret agenda" but simply because the ubiquity of liberalism, modernism and conciliarism have had SUCH a devastating effect on the minds and technical resources used in publishing that, after 50+ years of deliberate and constant liberal agitprop, certain elements of doctrine and discipline have been deliberately made MORE difficult to ascertain without extensive, exhaustive historical research.
Thus, the importance of traditionalist websites whereat many good Trads labor constantly to source-check, compare and offer intelligent commentaries.
Yes, it involves additional expense; original publications are VERY hard to find from before the Council and, thus, quite expensive in the after-market.
And it also entails sustained effort over years and years of labor, simply to help fellow Catholics to remain in touch with what the Perennial Magisterium and Sacred Tradition have decreed, explained and exhorted the faithful to cling to.