Also, check this Wikipedia article: https://en.wikipedia.org/wiki/Windows_Runtime
The Windows Runtime is already native. Creating UWP applications with .NET, the .NET code is also compiled to native code (when you publish the app to the store, and you can also select native code generation with the Visual Studio project settings). Here, you are using native runtime components - I think you've read about this in some articles. Can you supply links to these articles?
Hope this helps.