But Cyril had no authority you said, and the canon recognized was not the current Catholic canon.
There were various canons used in various areas of the Catholic Church until the late 4th century when the Church finally settled the matter in Council, approved by the Pope. no one when out and started their own church over the canon and no one used a 66 book Bible until the 16th century. that’s a long time to be in error.
do you want to answer my question - who on earth can infallibly say what books are canonical and which are not? anybody? can you?