That's an easter egger.
The best way to tell if you're getting a real ameraucana imo is look for a variety. For example, when you buy a Plymouth Rock they are labeled as White or Barred, etc. If you get a leghorn it's a white leghorn or a brown or an exchequer, etc. Ameraucanas also come in varieties, such as blue black splash, or wheaten or buff.
Your chicken doesn't meet the written breed standard for an ameraucana. Look at the description on the label you posted; "Commercial hatchery ameraucanas have not been bred for a select color". But the APA lists only select colors. Which means they're mixed together - they're mutts. Chances are if the hatchery is more than 40 years old their "ameraucana" lines may even be a mixed line that predates the official breed standard for ameraucanas because they are a more recent breed.
But most people don't know the history/politics of ameraucana breeding. Suffice to say that in the future it's safe to assume that all hatchery "ameraucanas" are easter eggers. It's a reaaaaaaally big and common problem in the chicken industry.