Technically, yes, meets the SOP AND breeds true 50%. HOWEVER, as all too many of us have experienced, ethically, I strongly believe a breeder SHOULD NOT label their birds Ameraucana if they have a recent cross breed. I cannot define "recent" because I am still a newbie. But if a bird is throwing 49% off colors when bred to a tried and true Ameraucana of the same variety, I personally would hope the breeder would label that as an EE.
I only say this because many of us have had the unfortunate experience of purchasing chicks or even full grown beauties that meet the standard in phenotype, only to hatch many chicks that have offshoots. I am not talking about one every hatch. I am talking just under half. Not fun.
Just my opinion....