Don't forget there are two Aldi (Aldie?) the yellow South and the Blue North and they both have a different international footprint just to complicate things
I popped into an Aldi in Portugal ~6 months ago, and I noticed they had some Trader Joe's products on the shelves. Unsurprisingly, Aldi Portugal is owned by Aldi Nord.
As an American, I can understand the European internet user’s chagrin at our seeming total cultural ubiquity. It seems like almost every piece of media is about American concerns unless explicitly stated otherwise.
Just the other day the US news were all ablaze about how the Super Bowl was the biggest viewed program on television since Apollo 11. Except of course, the Eurovision Song Contest is way bigger.
Aldi was pretty ubiquitous in the rural Midwestern United States around where I grew up in the 1990s. We didn't associate it at all with Germany or Europe, and I had no idea about the company's origins until I read about it on Wikipedia many years later.
If you are the creator, the problem is more the title. You could write something like "Aldi Price Map in the US". Your current title is a good example of US defaultism and I happens way often (even in social studies where the scientist should be just embarrassed for that).
There is a link to raw data (a big json). Aldi is Hofer in Austria. Prices are probably the same in all their stores? Not sure something similar exists for Germany.
For me Aldi is just such a european thing that I was genuinely surprised by this.