The data in that part of the app is also old/incomplete for DL flights from AMS/CDG. Check the app when you have a DL flight leaving from the USA. Then the upgrade/standby list will be full with names, seats and zones and everything will be up to date.
Nevertheless I wouldn't rely on the DL/AF systems next time. I'm pretty sure the gate agents/red coat can fix/add you on the proper list when asking.