Big question now is if the servers/machines are set to a cloud boot.
LAN PXE boot would be possible without internet, but not a cloud boot.
PXE boot is a setup where a main server has the operating system files, and a networked attached machine doesn't. The network attached machine (thin client) gets the boot files from the main server over a network cable. In house, it is possible to have no internet access, but not if the servers, or the thin clients, are getting it's OS files from the cloud.
If the precincts are running a cloud PXE, then a voting systems tech only needs to change OS settings on the cloud server. No access needed to individual precincts.
Pretty fucking big development with the Cloud PXE question.