That source tells the truth. What evidence do you have that Luther EVER questioned 2,3 John and 2 Peter? Plus, as the source I gave you stated, Luther did not "defame" any of the New testament books. What you keep oddly leaving out is that Luther was FAR from the only one who considered the Deuterocanonical/Apocryphal books as non-canonical - not as Divinely-inspired Scripture. He had plenty of company both in the early church as well as Roman Catholics leaders going into Trent. Would you like a link to that documentation as well?
None needed. Contrary to your assertion, I referenced that in my original post. Although I would hardly call 2 out of hundreds, “plenty.” The purpose of an ecumenical synod is to reach a consensus through argumentation and reason. there is no need for an ecumenical synod if such a consensus already exists. Indeed, several key Catholic doctrines were infallible because the pope found a consensus already existing (against abortion, for the immaculate conception, for the assumption of Mary, etc.)