Only time for a quick look - excellent detailed table above.

However, the table looks to be Seat fare product only, and when one looks at AKL-CHC on FlexiRefund for P class the move from $139 to $159 is a 14% increase, nowhere as dramatic as the 29% increase on a Seat P fare.

I have also determined that the SP and $AP earn rates have not changed despite the fare increases. So a very significant devaluation in the Airpoints program.