I wouldn't call it "whining ramblings". But I find it odd that this letter, dating back one month ago, emerges two years after the news of the lawsuit. What I would like to know: what happened between those two years?
It would seem that the outcome doesn't look so peachy for the litigant and they may be interested in the scorched earth path. Going into the holiday spend season, maybe trying to give Munira a bad winter? Oddly, for Amazon, it's easy to restore any ill will in this case. They know how to lever up positive emotional feelings for their consumers. While 10's of MM is money, if Discover is the second largest with <20MM/yr, that's small beans in the revenue stream there.
So, if consumers and other revenue streams are vastly more important, I'm not sure that the impact of ad sales due to a bad actor crossing someone who doesn't understand political acumen - come on, a desperate email to your bosses boss?? WE NEED THE MILLISECONDS!!! - is all that important. Easy enough to bump Munira (right thing), give Kivin shut-up money (right thing and expedient), and move forward steamrolling online retailing...