No one had ever challenged the canon prior to Luther to the point of printing Bibles with a Prefaces that said seven books in the Old and four books in the New Testament were not inspired.
The Catholic Church had to make a statement when they did saying the canon as it existed to Luther's throwing books in the garbage was the one and only acceptable canon of the Old and New Testaments so that in 2015 Alynsky style anti-Catholic chatterboxes wouldn't be saying trash like,
"The Church didn't change what they used but they never officially stated that the Anti-Christ Pharisee Approved Luther Subset of the Bible wasn't acceptable."
Followed by a lot of faulty logic about how if they knew the Luther Subset was wrong they would have spoken up but since they didn't it's an admission that they know Luther was right blah, blah, blah
Know Nothings is an extremely good description of the anti-Catholic crowd to this very day.
The transparent Alynsky game of damned if you do damned if you don't isn't characteristic of Christians, it's characteristic of frauds pretending to be Christian while working hard to divide Christians against one another.
Yawn. Have a nice day
Alinsky tactics indeed! If you keep repeating that Luther threw books of scripture into the garbage - even though you have been shown countless times he did no such thing - do you think it will become true or people who DO know better will change their minds? Why post transparent falsehoods?