They ended up offering me something making it worthwhile to stay a couple more nights December 29-31 just to cross the 100 threshold (105 including credit card nights) even though I did not really need a hotel for those couple of nights. So they were serious about the credit card nights no longer counting for AMB, but at least were kind enough to acknowledge that the way I ended up in this situation at the last minute was partially their own doing. So all ends well and I remain a happy guest who will stay with them 100+ nights and $20k spend in 2019 as a result.