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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Seems to have resolved itself.
You are supposed to mimic what the 'delete' keyword does, which is return false when trying to delete a non-configurable property. 'delete' is responding to you request by saying it will never delete that key, move along.
Your interpretation would also be useful behavior, but it's not what they were looking for.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/delete