The GTD isn’t on the configurator on VW’s website either.
With the official unveiling of the mk8 Golf suggested to be some time next month, VW may well be in the process of closing the order books on some of the mk7.5 Golf models. If they’ve accepted what they consider to be sufficient orders of certain models to take them up to the end of mk7.5 production, then they may have closed the order books on certain models, and the GTD may be one of these models,
As for lots of extras being included in the price on certain models - pretty much normal practice when a model is almost at the end of its lifecycle, to maintain customer interest in the current model until the new model arrives. Probably some good discounts available on the mk7.5 too over the next few months for anyone considering a new Golf if they’re not bothered that it’ll be an ‘old’ model in a few months time.