They said at the start that it was a normal "pay as you go" day
I haven't watched it all again just to check this but when they cut to the 'ring Paddock, Rory says "this is a typical German track day" which is not "pay as you go" touristenfahrten (tourist driving).
The marshall in the barrier is just waving people through which doesn't happen on a tourist day as drivers have to put tickets into the slot.
Plus if you've been to a tourist day you will notice that there are far too few crap or even average cars in the paddock shots, many (but not all) people with good sense and good cars only drive the 'ring when it's a closed track day and the standard of driving is higher.
I agree I think it was a bit false and someone like Chris Harris will be hating all that seeing as he is a hardened factual car journalist primarily but as entertainment for the masses goes it was perfect as everyone keeps on telling me. I even told my 85 year old mum to watch it!
The real less exciting point of the film should have been a far less sensational message that an average driver will be able to drive the 'ring quicker in a CSS than a Lambo or 911 or probably even an M3 because it's a narrow bumpy circuit more suited to a powerful hot hatch for anyone other than expert drivers.
Imagine the complexities of trying to turn this into a film and you can see why it morphed into such a factually dubious but enjoyable nonetheless bit of TV.
However as a GTI owner for the last 21 years it heartens me to see the GTI getting such praise on a TV programme with such a massive global audience which can only mean good things for the future of the GTI in what is a very uncertain motor industry and that can only be good for anyone who is a member of this forum.
If you remember the bad old GTI days from 1992-2004 seeing the GTI back at the top of the tree is even more poignant, WELL DONE VW!