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> They are electrically connected by sets of physical cables.

Pedantic: Fibre and wireless do not fit this criteria, but I still agree with the spirit.

Extra pedantic: Ethernet cables are galvanically isolated at both ends. There is no electrical connection at all.

I guess we can say both instances are electromagnetically attached. But then, basically everything is.

That isolation is within the devices, so the devices are still electrically connected, right?