I doubt they would see this is a change. Taxes and fees get charged on reward tickets. Taxes and fees change from time to time for any number of reasons.

There were never any rules published about what the taxes and fees were, or how much they were. That they were far less when booking on *A partners was not part of the T&C - it was merely an observation on our parts.

In the long term, look for other carriers to reciprocate.