Capn Bloggs is correct. Neither CAO 20.7.1B nor CAO 20.7.4 has changed since 2014. The heading of the CAAP is, therefore, now misleading: "New performance provisions for CAO 20.7.1B and CAO 20.7.4"
The CAAP states that the most recent changes to it were in October 2020. The CAAP states:
This [2020] revision has been issued to incorporate advice regarding the legislative safety factors used with actual landing distance performance data from the
latest FAA guidance material.
The "legislative safety factors" are what they are and haven't changed, and no amount of "advice" will change them.