I sleep on a My Pillow, but there are a couple of incorrect statements by one of the speakers in Mike's video. After 1:28:00 in the video, he shows a couple of diagrams from the Dominion manual showing Ethernet connections and then tries to conclude that "ethernet means internet". This is not true. Ethernet is only a cabling system and does not imply that an internet connection is part of that. In addition, one of the photos shows a Firewall which would be normal to keep any other users that are connected to the State's network from being able to access any of the Dominion equipment on the protected side of the firewall.
I am not saying that there is any proof here that Dominion was or wasn't connected to the internet, I'm just saying it is not correct to say that just because you are using ethernet cabling to tie network devices together that it is 'proof' of a connection to the internet.