For them to add that line to a map with an otherwise extremely low level of detail and realism seems like it must have been intentional. I have just as little sympathy for the studio as I would if they had snuck in a swastika.
Hanlon's Razor seems to apply.
My mom never heard of Germany or Nazi or World War 2. She will happily draw swastikas during festivals.
It seems to me that a map like this is a Rorschach test—you'll see in it whatever you expect to find.