My take on it was that it might be something like USB-C (w/ Power Delivery) or Ethernet (w/ Power-over-Ethernet) where you have data and power signals together, with a "standardized" (as in, many identical connectors, not that there's some open standard) plug, and use switches / hubs to connect everything.
Most likely would have 48V power, ground, and both a high speed CAN bus and ethernet signaling (though you could probably get by with just one or the other, CAN bus would be limiting for a few applications and ethernet overkill for most), possibly low speed CAN too. Certain wire harness segments might omit one or the other (i.e., your window switches might be power, ground, and CAN bus only). Each 'last mile' segment (a segment that terminates in something like a switch or gizmo, not another hub/switch) would just go to the nearest hub/switch, rather than having dozens or hundreds of wires running back to a common location. A hub-and-spoke or star topology rather than a home run one...
And then you have a second, logically identical, but physically redundant set of connections. Possibly with the non-terminal connections being arranged in a ring (or two rings) so that no single point of failure (except on a terminal run) could interrupt data.