Superfat is extra saponifiable fat or fatty acid in the soap than is strictly required to exactly react with the alkali.
A small amount of superfat is used to ensure there is no excess lye in the soap. Additional superfat can be used to add mildness to some types of soap. An example is 100% coconut oil soap which is very harsh to the skin without a high superfat %.
Since 'cones don't saponify, they can't ensure the soap is skin safe. I also doubt they would add mildness to a 100% coconut oil soap. So I'd say they don't qualify as superfat. I'd look at 'cones as more of an additive.