That's why the map says meatball "inventors" instead of just meatball inventors

The Franco-Ottoman alliance of 1536 stands strong

I think you confuse that with kåldolmar, which has that origin. Meatballs were quite a staple in most Northern European countries for centuries before any of that. Of course Sweden didn't invent meatballs either, they just popularised them outside of Europe via Ikea.