No, it means air-gapped. Traditionally this just meant no wires to other computers (and an autonomous power source if you're extra paranoid). Today of course it more broadly means no direct communication with another computer, including things like WiFi or Bluetooth.
External media has always been used to transfer data between air-gapped systems, and it's always been a weakness. USB drives are just smarter than older forms of external media, posing a greater potential threat.
No, it means air-gapped. Traditionally this just meant no wires to other computers (and an autonomous power source if you're extra paranoid). Today of course it more broadly means no direct communication with another computer, including things like WiFi or Bluetooth.
External media has always been used to transfer data between air-gapped systems, and it's always been a weakness. USB drives are just smarter than older forms of external media, posing a greater potential threat.