Made a payment on my DL Amex, and two reps and their supervisors confirmed that Plastiq wasn't part of the shop small promo. Charge went through on 11/14 and still no 2x points. 2nd supervisor agreed to put through a request to the promotions department to honor the double points upon presentation of this website:

https://www.plastiq.com/blog/2016/10...rough-plastiq/