Worse than that, WT sets up a false dichotomy here: Bible versus Tradition. It's not about Bible-based teachings v. tradition-based teachings at all. It's about believing in God and following the leading of his Holy Spirit.
WT has a phrase they ought to copyright: "God'sWordTheBible". They link the two together when they ought to be separate. Until a person realizes that simple truth they'll be hoodwinked by specious arguments such as the one above.
God's Word isn't the Bible. The Bible and scripture are not the same thing. WT either doesn't know or doesn't care.
AB