Evan, can't give you an "official" answer - I don't have one - but since the '88 Scirocco is still the A1 chassis, it's an interesting argument. As you pointed out, there's no clear definition of "model" in the GCR.

If you're interested in running in Super Touring, send a request to the CRB for review, and include these points (and anything else you can offer in your favor).

GA