There are people out there that believe any kind of barcode (or other graphic data transfer methods) influence everything around these codes. So having a regular barcode on your food items influences the food itself according to these people.
So Sonnentor decided to draw a line through the barcode so it can't "affect" the food anymore.
It's unscientific bullshit that's why they got a lot of criticism for supporting these weird believes.
Oookay.. was regular DUI too boring for him or what?