I wrote the original RVC DIY on the VWgolf.net.au forum.
This is a little bit hard to explain.
The yellow lines are straight in standard form. But if you bought the car with RVC installed there is an option to set them to "reverse parallel park". When in this mode the lines sort of cross, helping you reverse parallel park. I have never seen them move with the wheel, at least not in Australia.
When doing the DIY I have never found the coding to allow the reversing lines to be set to cross (reverse park). it must be there somewhere.
Chris