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Everebody is forgetting that Alejandro's A5 3.0 TDI has a MTM Cantronic unit installed.
With a really cold weather TDI engines increase its performance, but it depends on the air Temperature/boost/injection ratio maps of the ECU, because with really low temperatures probably the ECU decrease the power delivered to make easier and safer the driving.

Besides, it's possible that the Cantronic unit detects the temperature below 0ºC and stop modifying the stock ECU values trying to protect the engine and clutch of a bigger power delivery due to better conditions (colder and more dense air, so with more O2 and bigger power as a result).

It's only a guess, but I'm sure that a mail to MTM asking about it will answer the question.
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