As Jesus told the Pharisees, Matthew 15:6 "...You nullify the word of God for the sake of your tradition."
Yes, traditions that authentically contradict the Scripture do nullify the Word of God, no argument.
Catholicism may say that nothing exceeds the scripture in authority (though, honestly never heard a Catholic assert it in those words), but in practice scripture takes a back seat to the councils, Church Fathers, and overall tradition. This is because, in Catholicism these things are viewed as holding the correct interpretation of scripture. So, even if the teaching in fact isn't found in scripture or even contradicts scripture - it doesn't matter to the Catholic.
Whether an authentic Catholic teaching ever contradicts Scripture is an open question; it hasn't been proven.
In fact, for the longest time the Catholic laity weren't taught to read the scriptures period - and were even punished for making it accessible to others in the common tongue.
Vs. the Scripture is read at every Mass.
The papacy and the idea of infallibility are one such invention. In fact, the formal definition of Papal Infallibility didn't come around until the later half of the 19th century in the First Vatican Council (
https://en.wikipedia.org/wiki/First_Vatican_Council), and even in Catholicism there were those who opposed the idea.
Who are the people "in Catholicism" who opposed it?
Let me set out for you Catholicism's own take on this matter, it's quite simple.
A. God the Father said to listen to His Son, the Lord Jesus Christ.
B. The Lord Jesus authenticated the Old Testament as the Word of God, and He said to listen to His Apostles.
C. The Apostles said to listen to the bishops.
D. The bishops today say what's in the 'Catechism of the Catholic Church.'
The words of the Apostles after Pentecost are the Word of God (1Th2:13KJV). The Apostles taught by written word (all extant Apostolic writings are already in the New Testament), and by spoken word. The Apostles especially instructed the bishops, and the bishops were tasked with both teaching the Word of God, and with preserving the Word of God in perpetuity /until Kingdom Come.
Whenever Church councils concluded, the bishops' witness of the Word of God emerged from them more uniform than when they went into them. Their witness was more pure after the council than before the council. This is true for every Church council, including the first one, recorded in Acts chapter 15. During councils, all the bishops 'compared notes' and decisions were authoritatively made about what was the one Apostolic witness on the matter(s) in question during each council.