There is no official confirmation of the NAC faction's canonicity from EA/DICE. Why is it still not canon?

Hey there,

The NAC was a community created faction for Battlefield 2142, and as a result isn't really canon whereas PAC actually is.

Now that's not to say it may never be, because Battlefield as a franchise has an history of bringing in our community, referencing them and adopting some of the creations our awesome community does at times. A direct callout could be the likes of Battlefield Friends, but as it stands in the lore of Battlefield 2042 > 2142 it is not currently canon in regards to 'NAC'.