After Jones Soda did the six-pack of Thanksgiving dinner themed sodas (including Turkey & Gravy), this kind of thing just doesn’t surprise me any more. I guess it’s meant as more of a novelty thing than something people would actually use in seriousness.
I spent a few months in Germany years ago, and “Americans” (Amerikaner) tended to be used to refer to people from the Americas (either NA specifically or NA and SA collectively) in my experience. If you wanted to say someone was from the US, you’d say something more like “aus den USA.”