I called back, and reached a supervisor. I explained the scenario, and pointed the RUC out. The supervisor said Delta reissued the ticket, showing as OL and that I was credited properly in line with Delta rules.

The supervisor then gave me a lesson in the MQD crediting, reading off the below from the Partner earning page on Delta.com




I asked why then, does the JFK-LAS leg show as mileage credit based on ticket price. They said there was nothing they could do, and to write a complaint and was left on hold for about 5 minutes before the line disconnected.

At a loss for next steps to be honest.