This is true, but the thing is, you don't have to follow the recipe. When I made a batch of this, I just bought the 7x concentrate from Cuba-Cola (https://cube-cola.org/index.php?route=product/category&path=...) and then added like half the amount of sugar it called for when making the concentrate, so that it was more like a 1:1 sugar:water ratio ("simple syrup") rather than a 2:1 ("rich syrup"). It didn't taste as sweet as commercial Coke, but it tasted fine.