Yeah don't take their forecast to heart, especially recently with the bad model runs for December about a week ago. Now the disaster torch that was advertised over the past couple of weeks seem to be getting pushed back and now it isn't so much a torch now but just generally mild, so I see how they have a higher confidence for BN vs AN.
I have noticed that it may end up being the opposite of last year when the long range seasonal/monthly models kept on kicking the can down the road for a NAO block of all blocks that never actually happened until it was too late. The models this year may end up pushing the unfavorable setups back and we could end up averaging a legit -NAO for the winter.