So, took the door panel off, checked the door card to armrest and looks like the card is welded (plastic) to a monolithic plastic piece that is attached to or part of the armrest. Took before pics, see circled in red the 5 connections to the armrest on the first pic, 2nd pic is zoomed in relative to the first pic.. Put in some #6 screws from the backside to reattach; seems real solid now. If that doesn't hold up will add/inject some epoxy into the holes one by one.
I learned on the 2011 not to use the door to assist in getting in the truck, makes the hinges squeak (especially when warm). I have a habit of getting out of the truck, then pulling the door armrest from the inside to let the doors momentum close; on retrospect that would add a shearing force leading to the breakage.