It seems to say that it would report any wifi devices MAC address, which would include the devices connecting to the network and the routers providing the network.
But you'll have no idea what they are. They could be anything from a router, to a smart light bulb, to a thermostat, to a security camera, to a cell phone, etc.
I'm sure plenty of polling places will "light up the alarm" - what polling place doesn't have some wifi network for SOMETHING? And some people will have cellphones trying to connect to that network etc.
I don't know specifics about voting machines, but from a security perspective, their network connections should 100% all be hard wired. Wireless just adds more security holes. They should be hard wired and wifi sniffers will never touch that.
So either you get no alarm and it could still be hardwired to the internet, or the alarm goes off and you don't know if it's the voting machine or Billy Joe's iPhone trying to connect to the voting centers open wifi network.
The whole thing is entirely pointless.