“The whole reason Luther argued against the canonicity of the deuterocanonicals is because they flatly contradicted his doctrine.”
No. The closest one came come to a doctrine ‘proved’ by the Apocrypha would be prayer for the dead, which even then is suggested by one or two verses. Luther had no ‘need’ to remove the Apocrypha over doctrine. He removed it for the same reason Jerome rejected it - because it was not good for doctrine, correction and reproof, as scripture is. It was not accepted as scripture by Jesus or the Apostles.
To challenge the Catholic Church on theology, all Luther needed to do was translate the New Testament and get it into the hands of commoners. Scripture is an arrow in the heart of Catholic theology.
Nonsense. Go check his 97 theses: No mention of the “apocrypha.” It was after the debate at Leipzig (I believe; I might have mixed up confrontations) that Luther, shown that the bible very clearly argues against Luther, that Luther moved against the “apocrypha”