I dont mind being corrected at all, If I feel strongly enough to debate it more I will, but If I'm wrong I'm wrong and will say so. What does make my blood boil is that mistakes were made by both people, i.e. chassis and xds. Yet my quite rightly corrected mistake was me being 'owned' and the xds mistake was swept under the carpet. How convenient.
His mistake was very minor, yours was epic 
Of course it was, I can see someone new to the world of buying a GTI reading this technical 'owning' persons advice and going to a dealer and giving their spec and having XDS down as an option, dealers says, thats standard. Ah ok says the buyer. Buyer gets his car, XDS is there but was thinking, where's the sport and comfort modes... Dealer, erm thats not XDS thats ACC you never asked for that. Bit of a pisser for the buyer no ?
Buyer gives spec of car to dealer, Buyer.. 'the 6 have the same chassis as the 5 ? Dealer, yep it does. Buyer... Cool.
Where's the epicness in that ?