The USB connectors are part of the MDI kit that only work on the newer head units ending in 10.
If you get an RNS510 sat nav you can get that kit, but its pricey.
I don't think he is refering to that!
Previously VW offered either an ipod or usb connector option for the central arm rest.
Apparently because so many complained about the usb connection not working with their mp3 players, VW stopped selling them. The connection was really only meant for an usb stick and not a mp3 player.