Qada Of Nafal Fast?
It’s not obligatory to make up for missed nafl fasts. If you read the verse of the Quran that you referenced in it’s context, you’ll have a better understanding of the the matter under discussion in that verse.
Hadith narrations without valid references can’t be verified. Also independently, narrations do not serve as the basis for any legislation.
But they do explain and clarify Quran,so maybe this Hadith is the explaination of that verse of Quran mentioned above?