this is not true, sugar is sugar* -- what matters is how it is consumed, not how it is added. if sugar is consumed with a lot of fibers then it will be absorbed slower by your intenstines. the same fruit consumed as juice or whole fruit impacts how the sugar is absorbed.
Most overweight people (the audience of a calorie counting app) don't need more nutrients, they need less calories. Besides, fruit is a really poor source of vitamins/minerals in general, so this is a weak ground to stand on.
> [added sugar is] absorbed by the body much more quickly.
[1] sugar is actually multiple sugars, and different sugars (glucose vs fructose vs sucrose) - https://www.healthline.com/nutrition/sucrose-glucose-fructos...