VCDS works with all VW/Audi models that support "Rapid Data Transfer" going back to MY 1990 or thereabouts. Whether they are "OBD-II" or not isn't really relevant. There are a number of VW models from about 1994 on that had OBD-II style diagnostic connectors but that didn't support the OBD-II protocols at all. VCDS works fine on them. There were also even older ones (and Canada model Audis maybe as late as 1997) that lacked OBD-II ports that had the "2x2" diagnostic connectors in them that look like this:
The above mentioned adapter is what you want for those cars.
PS: This doesn't really belong in Retrofits. Moving to Pre-Sales Support.