Whilst manufacturers have had since September 2017 to get WLTP type approval testing done, because most OEM's have new models each year I think we've hit the perfect storm of MY changes and the hard deadline of 1st September 2018 for WLTP being a requirement for sale.
Even if VAG had done all of the testing from last September, the MY19 models won't have been tested because they are new NOW.
Obviously they could have spotted this problem, but they haven't. Not sure why when the automotive industry are very good at planning...