Except the FDA explicitly passed a rule saying allulose didn't have to be labeled as an added sugar because it's not metabolized the same, and only has 1/10th the calories of a real sugar.

https://www.federalregister.gov/documents/2020/10/19/2020-22901/the-declaration-of-allulose-and-calories-from-allulose-on-nutrition-and-supplement-facts-labels#page-66219