Apps have different aspect ratio layouts. They know the dimensions of the screen they are on, and they can adjust accordingly.
So while technically you are using the phone version of the app, Superscreen will scale and adjust the aspect ratio to align with Superscreen specs. Images for all apps other than video will fill the screen in the production model. So it will feel like the tablet version. Video is played at the aspect ratio of the video, just as on your TV or other devices.