Wrong.
At the boost levels in the game it was "available" for deployment at the end of December 1944.
If anything it should be pushed to January 1945 which would more likely be actual deployment.
What about the La-5FN and La-7 dates above (3-43 and 6-44)? The performance of both of those planes we have in game was not reached until months after those dates. Just out of curiosity when was the Spit XIV with 2x.50" instead of the 4x.303" in combat? Was it 5-44 or later? I thought it was summer of 1944, but I'm not sure which is why I'm asking. I'm sure you can find a lot of examples if you spent enough time looking. We don't have earlier versions of many of the models in the game, so going by what seems to be the precedent in the list above 11-44 is reasonable for the Dora.