Check your videos again. The file menus respect the notch. Only dock icons on the right, if they are very wide, might end up under the notch!Why do you say that? I've seen videos that seem to show otherwise. Apple's own explanation is "If app controls or menu bar items appear blocked or hidden behind the camera housing, you can turn on "Scale to fit below built-in camera" for the app to adjust the active area of your display."
How to adjust an app's settings to appear below the camera area on your MacBook Air or MacBook Pro - Apple Support
You can adjust an app’s settings so that it uses the whole display or uses only the area below the camera housing.support.apple.com
I am writing this on a 16"notchbook so I think I have a reasonable idea!