They dynoed the stock car and got exactly 181Bhp? Output of the MK7 TDIs seem very precisely controlled by the ECU if that isn't massive coincidence. A true 226Bhp after upgrade is pretty impressive.
To me that just shows the dyno and dyno operator they used know what their doing and its setup reasonably accurate. Most cars on a correctly setup and operated dyno produce stock or near stock figures if not its normally the rolling road setup at fault.
For reference the rolling road used was at shark performance and im sure they had no reason to make any coincidences for a rival mapper..
Having the Dyno read 181 Bhp for stock is a good reference point anyway for gains proportional to stock if nothing else. It could also mean that the old days of VW understating their engine outputs might be at an end if they do now have the level of control in the ECU to peg GTD output to 184PS and the GTI to 220PS with very little variance.
It's a pity these boxes (as with most of the competition) are sold on their mpg gains too. The only mog going up is the discrepancy between indicated (as displayed in the MFD) and actual (brim method of determination). More fuel through on any given throttle pedal press. Buy for the power gains only.