Can you really call it an air-gap if you're using a BLE radio? I mean, yes, technically the information is transferred over the air rather than through a wire, but you wouldn't call a cell-phone an air-gapped device because it has half a zillion radios inside, many of which you can't even reliably turn off.

Looking at the recent Broadcom wifi vulnerability -- just having a phone sitting there with the radio on is enough to let an attacker gain root on some devices.

I've generally seen the term "air-gap" used to mean "as isolated as possible" -- i.e. take apart a laptop and remove all networking hardware, microphones, speakers, fill all the ports with epoxy, and connect it to an isolated battery / power supply.

If an attacker can poke at your device by sending it custom BLE packets without your knowledge, I'd argue that it doesn't qualify.

From the video:

The firefly is receive only, so it cannot be remotely hacked.

Bullshit.