On the contrary, Holy Tradition is endorsed in verses such as 1 Corinthians 11:2 and 2 Thessalonians 2:15.
The context for those verses you cite eisegetically the Pharisaical tradition, which became the basis for Rabinnical Judaism.
The Apostolic Tradition, which is preserved by the Orthodox, and also in some high church Anglican, confessional Lutheran, and other liturgical Protestant churches, and in traditional Roman Catholic congregations that reject modernism, particularly those which retain the Traditional Latin Mass and in the sui juris Eastern Catholic Churches, was not the subject of those statements.
This is why the leading figures of the Reformation such as Martin Luther, John Calvin, Thomas Cranmer and John Wesley expressly recognized the role of Tradition in assisting in the interpretation of Scripture. Hence the Anglican tripod of Scripture, Tradition and Reason, and the Wesleyan Quadrilateral which adds Experience to the above.
What Martin Luther was seeking to do with Sola Scriptura, as my confessional Lutheran friends like
@MarkRohfrietsch can confirm, was to correct obvious errors that crept into the medieval Roman Catholic Church (which had contributed to the schism with the Eastern Orthodox in 1054). He was not seeking to do away with most fixtures of traditional Western Christianity, and thus Luther celebrated the Eucharist every Sunday, made the sign of the cross, and even prayed a modified version of the Hail Mary.
Likewise, high church Anglicans retained many of these traditions, and would in the 19th century restore those that had been wrongfully suppressed in order to appease the Puritans in the aftermath of the English Civil War (and which were not suppressed by the Scottish and Non Juring Episcopalians, who ordained the first Anglican bishop for the United States, after the Church of England was prevented from continuing to provide episcopal support such as ordaining presbyters for the former British colonies for political reasons).
And of course the Eastern and Oriental Orthodox had the fortune to never get caught in a power struggle with Charlemagne (which was a key event that would precipitate the emergence of Papal Supremacy), and likewise never underwent a dogmatic shift (which the Roman Catholics demarcate by saying that St. John of Damascus was the last Patristic theologian, and by referring to subsequent theologians, whose teachings were innovative and in some cases arguably at odds with Patristic theology, at least that of the Greek and Syrian fathers, as Scholastic, starting with Anselm of Canterbury.
Of course, Scholastic Theology was by no means entirely antithetical to the received tradition - some of what St. Thomas Aquinas wrote was very insigntful, for example. But there is a noticeable distinction between the writings of the Fathers and the Orthodox theologians on the one hand, and the Schoolmen on the other. In particular, the idea of systematic theology seems to have originated with Aquinas and was later taken up by John Calvin, with their
Summa and
Institutes respectively being the first two widely known works in the field, and subsequent systematic theology has been dominated by Calvinists, most notably Karl Barth and his ponderous eight volume
Church Dogmatics.