Just got off the phone with the rep, after this lengthy process VWoA advised that this is not covered by the extended warranty from the TDI fix for my 2012 golf. Seems sketchy, my guess is that in colder climates they might lean more towards covering it at a dealer, but that is just a guess. I do suggest that if the dealer won't work with you to contact VWoA and see if you get a different response.
If they don't work with you on it, I highly suggest getting a winter front. I bought one for mine after this happened and it has been fine, quicker warmups too. The right conditions might not have come around yet for this to happen again here, but from what I've heard it is well worth doing.