Depends on the brand and the setup / installation.
I know some brands have the cistern water supply and the seat water supply integrated and concealed within the unit, and other brands that need a separate water supply to the cistern and a separate water supply to the seat.
That picture may be a view from the clean side - with the electrical connections and water connections on the opposite side of the photo.
I do quite a few of these and when you see a flexi connector and power cable coming out of the seat to a water connection and power point, they look very ordinary.
The best ones are the ones that have the seat, cistern connections and power supply hidden inside the pan.
But they are the most expensive ones.!!