That's because European Aldi's gets their chicken from Europe, while American Aldi's gets their chicken from America. They don't ship chicken across the Atlantic.

The root issue isn't Aldi's, it's the quality of food on the different continents. Food standards are much higher in Europe, so any grocery store is going to have generally better food than stores in America, unless you only shop at high-end places like Whole Foods and make sure to only buy good food there.