Well, parts of the UI are done with web views, but it's invisible to the end user. This is how hybrid apps should be done, not React Native or Cordova or whatever's being used these days.
There are certainly pieces of content using web views, but the part that jumped out at me is the article content view. If you attach a debugger to News and play around, it's not using web views to render the primary article content.
In the past I was able to get Xcode to let me debug the view hierarchy, but it doesn't work at the moment. Maybe they fixed that.
