Technically, I guess "sweet" is a taste, i.e. felt on the tongue, whereas flavors are smells...
Wikipedia's entry on Flavor [1] says:
A "flavorant" is defined as a substance that gives another substance flavor, altering the characteristics of the solute, causing it to become sweet, sour, tangy, etc. A flavor is a quality of something that affects the sense of taste.
So they claim that "sweet" is a flavor, which to me makes it obvious that Sucralose, being a sweetener, is acting as flavoring.
Approved artificial flavors: https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFR...
Approved artificial sweeteners: https://www.fda.gov/food/food-additives-petitions/additional...