My Bible is different:
2 Thes. 2:5 "Do you not remember that when I was still with you I told you these things?" (NKJV study Bible)
In this case Paul is reminding the church about previous teachings he had given them in writing.
Another warning about "Tradition" would be:
Col. 2:8 "Beware lest anyone cheat you through philosophy and empty deceit, according to the tradition of men,..."
I believe the most powerful condemnation of "Tradition" comes from our Saviour Jesus.
Mark 7:13 "making the word of God of no effect through your tradition which you have handed down. And many such things you do."
In this case Jesus was condemning the Pharisee's for their legalistic hair splitting and manipulation of God's law.
You said, "My Bible is different." So how long did it take you to find a translation that agrees with your point?
Which translation is literal? There is a vast difference between your version (modern) and mine (1611).