I have experienced this before with a different resource. Not sure what causes it, but the following worked for me.The documentation for ResourceObject has a "ContentElementLocations" property. I deleted the LocalObject directory, quit the kernel and then ResourceData succeeded. e.g.

ResourceObject["CIFAR-100"]["ContentElementLocations"]

which generates the following on my machine

<|TestData->CloudObject[<a href="https://www.wolframcloud.com/objects/c6af5ee2-7e65-42a9-af00-937115e4351f],TestLabels-">https://www.wolframcloud.com/objects/c6af5ee2-7e65-42a9-af00-937115e4351f],TestLabels-CloudObject[<a href="https://www.wolframcloud.com/objects/e8ef48ed-66ab-4165-a51f-1d73cea69373],TrainingData1-">https://www.wolframcloud.com/objects/e8ef48ed-66ab-4165-a51f-1d73cea69373],TrainingData1-CloudObject[<a href="https://www.wolframcloud.com/objects/2d3a1d21-a4b5-49e6-8c2d-5ebe5ad546b4],TrainingData2-">https://www.wolframcloud.com/objects/2d3a1d21-a4b5-49e6-8c2d-5ebe5ad546b4],TrainingData2-CloudObject[<a href="https://www.wolframcloud.com/objects/b4661564-8af5-4490-9bfa-12317fd6112e],TrainingData3-">https://www.wolframcloud.com/objects/b4661564-8af5-4490-9bfa-12317fd6112e],TrainingData3-CloudObject[<a href="https://www.wolframcloud.com/objects/fab8802a-33d6-449b-829a-bd2602375094],TrainingData4-">https://www.wolframcloud.com/objects/fab8802a-33d6-449b-829a-bd2602375094],TrainingData4-CloudObject[<a href="https://www.wolframcloud.com/objects/16ee8a69-1001-4751-ae77-2362c38cdd30],TrainingData5-">https://www.wolframcloud.com/objects/16ee8a69-1001-4751-ae77-2362c38cdd30],TrainingData5-CloudObject[<a href="https://www.wolframcloud.com/objects/b653d1f2-a9ff-435b-89fc-1097a396788e],TrainingLabels-">https://www.wolframcloud.com/objects/b653d1f2-a9ff-435b-89fc-1097a396788e],TrainingLabels-CloudObject[<a href="https://www.wolframcloud.com/objects/52ee04c5-9953-4ceb-b9f3-2f776a5dd424],TrainingData-">https://www.wolframcloud.com/objects/52ee04c5-9953-4ceb-b9f3-2f776a5dd424],TrainingData-LocalObject[file:///Users/rohit/Library/Wolfram/Objects/Resources/69f/69f1e629-81e6-4eaa-998f-f6734fcd2cb3/download/TrainingData/2992664539ec521f/data]|

If you see something similar, delete the corresponding LocalObject directory /Users/rohit/Library/Wolfram/Objects/Resources/69f/, quit the kernel and then re-evaluate ResourceData["CIFAR-100"].

Reference 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"]]