Exactly. Luther was acting as we’re called to do - hold our fellow Christians to account for their actions. And Rome didn’t like it - so they tried to eliminate the person rather than address its error.
It is 100% scriptural to hold others - even those “above” us - to account for their actions and positions. And if the person will not repent, then THEY are to be shut out. Rome got it 100% backwards.
Do you deny that Luther went beyond criticizing financial corruption to introduce new doctrine?