Interesting questiom!
Can the Church of Rome really disparage Protestants for actually USING Her Book (i.e. The Bible) and failing to go along with stuff that she either forget to include or else the Holy Spirit didn't move on the ECFs to include into the Bible?
No disparagement at all as long as you don’t try to attack the Roman Church.
If you wish to use it to save souls, please do so. If you wish to spread the Good News, then go with my fervent prayers for success.
If you use it to criticize the Roman Church, then you are merely analogous to the teenager who uses his dad’s phone to rag on his father on social media. That is when any good father will turn off the data plan and send the kid to his room.
Remember that the Bible doesn’t contain everything Jesus taught. John 21:25