All this proves is that Gabriel Sterling is not technical. Dominion provides an option for connecting a modem to their voting machines - because some jurisdictions require the ability to transfer information electronically. It is an option that GA did not purchase.
The funny thing is that whoever made this video is probably not very technical either and the Dr. that testified chose his words carefully - there is a difference between a virus and a cyber attack. A virus infection could render a system inoperable or destroy data, but it cannot create a phantom connection to the Internet to send data out or allow a connection in. The vast majority of viruses today are transmitted via the Internet.
Also, voting machines can be connected to a local area network (LAN) so that machines can communicate with each other via a switch. It is possible to connect a router to a switch that would theoretically connect the LAN to the Internet. The problem is that the Dominion systems are configured for a LAN and are not configured with a default route or a DNS server for name resolution. The router would have to be configured for the same subnet definition as the LAN and the PC network configuration would have to be modified to take advantage of it.
