I said that can be happen in Germany for remove the sodium/sugar via filter or something.
Just like most fruits have sugar as natural but some juice companies that make sugar free juice then they remove the natural sugar from fruits before pour in every bottle then shipping to grocery store.
Just like said "Sugar Free Grape Juice" or something.
If any juice that's no sugar added means no artificial sugar are added, all are natural.
kool-Aid is full of artificial, just taste like fake fruit juice.
For me, I rather to buy juice that's full natural, most are from shelves in cooler like part of dairy area.