If "Modernism" was inaccurate, who is to say "Pascendi" is not also inaccurate?  

We need to understand that we are still learning, discovering, finding what we once thought was immutable "truth" was simply the best we could do based on the knowledge and understanding of the time.  We are talking about God and Truth here - we will never get it perfectly right.  More we need to be open to seeing how much larger, complex, magnificent God is - we need to let Him out of the box we keep trying to put Him in.