Reference Avoid issue with ResourceData caching in Windows?
[1]: Avoid issue with ResourceData caching in Windows?
[Experimental] as of Mathematica Version 11.0
ResourceRemove[ResourceObject[“CIFAR-100”]]
“ResourceRemove deletes both the locally stored content and metadata”
or,
Not [Experimental] as of Mathematica Version 11.2
DeleteObject[ResourceObject[“CIFAR-100”]]