It’s possible to avoid this problem by just not removing the antenna assembly entirely. I secured the three cables and the screw holder together with a small cable tie to avoid them slipping out. You can fit the new screen without removing the assembly completely.
+1 to both BrianS and Xavier Fischer’s comments above. Even when the lug and the cutout are identified, it’s not easy to tell if it’s been seated correctly until you test the hinge. I found Xavier’s suggestion worked.
This step is still needed (before step 18, which shows it disconnected). I didn't notice this until I attempted to remove the display.