Almost correct...however..Yellow is considered the Permanent LIVE on the sony loom...and the RED is the switched LIVE (ignition).
All VWs with factory plugs on mk4's and below all have the wiring switched the otherway round to cater for the oem radio. so quite rightly so...you will HAVE to switch the red and yellow around on the sony harness in order match up correctly with the vw wiring.
Also, it mite b worth cutting the BLUE connected wire that also runs in line on the sony loom to the car..as that can cause complications.
Hope that helps.
regards