I do appreciate the difficulties that this issue poses to the Reformation. To admit that the Church ever established a canon prior to the Reformation would not only undermine the alteration of that canon, but admit that the Church had the authority to set canon and had provided the very Scripture that the Reformation hijacked. It is clear to anyone not belonging to the Reformation that the Reformation is clearly painted itself into a corner.
What I have observed is that the Protestant does not want to share Scripture with Catholics and as a result enter into communion with Catholics. The Protestant wants to possess Scripture. First to deny it to those whom he feels are not worthy and then to own it himself. He does the former by denying its shared state with Catholics and any historic role they had in canon, and defending its orthodoxy against prior heresies because of the precedent that would pose. He then imposes a personal ownership through an eisegesis that is completely his own. The problem is that there is no room for the Holy Spirit in that.
Your deduction is nonsense, as is the premise that Rome had a indisputable infallible canon prior to the Reformation, which you still will not admit they did not,
or that Rome’s authority is what really established Scripture,
or that Rome being an instrument for affirming truth would somehow negate the Reformation any more than the Jews being instruments and stewards of of revelation does.
RCs are blind to the fact that the church began in dissent from those historical heavyweights who, like Rome, presumed promises of preservation and authority gained them a level of assured veracity and perpetuation thru them, while the church was established on Scriptural substantiation and attestation, not the premise of assured formulaic infallibility which negates the need the weight of Scriptural substantiation, while assurance of the veracity of her decrees rests upon herself.