The manufacturer describes the delicate chocolate filling as being made without added sugar, using sweeteners instead. That is not the same as saying the product contains zero sugar: naturally occurring sugars may still be present in ingredients such as grain or egg, and the label should be checked if you need exact sugar values. The point of this snack is that the sweetness does not come from sugar that has been added as a separate ingredient.
The specific sweeteners are not listed in the product information provided, so if you need to know exactly which sweeteners are used, check the ingredient list on the package.
Because sweeteners are used, this product can be relevant for people who are watching sugar intake or reducing sweets in their menu. However, it is still a sweet processed food with a more balanced nutritional emphasis than classic confectionery, not a substitute for a balanced diet. If you are sensitive to sweeteners or high-fibre ingredients, test a moderate amount first.
If you are monitoring carbohydrates or sugar for a medical reason, check the nutrition declaration on the packaging and consult a specialist if you have questions about how this fits into your plan.