You’d have to utilize an API Key to get that to show anything right? (assuming that is supported)
So @Trash, if you have a user who has access to the restricted category and is assigned an API key, see if appending the api_username and api_key to the URL makes it return data.
Edit: I just tried passing an API username and key to a restricted category for an RSS feed and didn’t get the data, so it seems the RSS implementation isn’t looking for a key for validation. But the category json does return the detail.