Sounds like they abuse the words "air-gapped". According to Wikipedia [1]:
"An air gap, air wall, air gapping or disconnected network is a network security measure employed on one or more computers to ensure that a secure computer network is physically isolated from unsecured networks."
"An air gap, air wall, air gapping or disconnected network is a network security measure employed on one or more computers to ensure that a secure computer network is physically isolated from unsecured networks."
[1]: https://en.wikipedia.org/wiki/Air_gap_(networking)