Keystone added USB connection in model 3 so it's not really full airgapped device anymore, even if you can currently only use USB connection for updating firmware.
But if you don't use the USB cable it's still airgapped. It just can be made not to be airgapped.
Same as if I take my airgapped laptop, boot into the BIOS enable the network card and then plug in a Cat-5 cable.
Up until that moment it WAS airgapped.
Splitting hairs I know, and it's best to make sure people can't do something stupid (because they will) but probably not that big a deal with all the other issues out there.
-Dave