What does it mean "to see things as they really are"?

He’s contradicting himself. In his book he lists the Atthakavagga as being earlier than the DN, MN, AN, and SN. This is consistent with with the consensus of scholars who use the list compiled by Rhys Davies who’s list he uses in his book. @sujato says what he would change on that list and moving the Octads/Atthakavagga is NOT one of them.