Who says the "Lying pen of the scribes" refers to the biblical canon? They wrote a lot of other books you know, many which were not deemed canon-worthy and some considered heretical. Later they wrote the talmud too.

In Jesus's time he rebuked the scribes and the pharasees for coming up with a bunch of man made laws that they themselves didnt even follow. Theres nothing in thoses verses that says it is about the canonized books of the bible.