Like its one thing to say theologians and catechisms aren't infallible, and can err. Its another thing to essentially accuse them of abject stupidity.
One of the Church Fathers, (St Cyprian I believe?) was condemned for his error that heretics needed to be re-baptized after returning to the Faith.
St Augustine went back and forth on predestination and what it meant. He also went back and forth on BOD.
St Thomas, a Doctor of the Church, was wrong on the Immaculate Conception (though it was more a lack of understanding of modern science, than a doctrinal error).
St Alphonsus is not immune from error, either.
.
The difference between St Alphonsus and modern day BOD'ers is that St Alphonsus, even though he argued that BOD was "de fide", would readily cast aside his speculations if the Church had corrected him. While most BOD'ers defend this idea as if it is "de fide" and admit no room for error.
.
St Alphonsus died in 1787, at the beginning of the liberalization of the Church. It's not surprising that his error was not corrected.