I just installed my CNSD-210FM 2011 map and GUI update on my Avic X920BT and it recognized my ND-TMC10 traffic tuner and I can see traffic data now so this is confirmed. I'll post if I see any issues. FYI the map update also comes with Bluetooth firmware 3.22 which is installed separately from the map/ GUI update.
The install requires you to enter your device ID from your service info page along with the enclosed media key (ala windows activation) and returns a password (hex) to activate the installer on the radio.
-Keith