No, you may have completely misunderstood.
If you want to change some notes you written you would use the app "osmo" to update / change /remvoe your notes.
The application allows you to add/remove/change notes, etc, which are saved within the users home directory
as shown above.
Uninstalling a package or reinstalling would not touch anything with the user home-directory.
Example of another "app" libreoffice:
Imagine that you uninstall Libreoffice and that would remove all your Office documents,
you wouldn't want that, would you?