If you don't have USB remote enabled, then when you apply 5V to the USB port, the camera switches into "data transfer" mode. The screen will usually go blank or the camera will "beep" as the camera waits from requests from the computer it thinks is attached to the USB port. So if that is what you saw, you were not actually taking pictures when you activated your remote USB switch.
Take a look at the diagram just below the text you quoted from the wiki. It should help explain the various operating modes of the USB remote.