It's been a while since I've used eZ Newsletter but having a look back over notes I made at the time I just removed the Topmenu_content part of menu.ini as it just seemed to cause more confusion than any editor needed. The newsletter_setup/general is part of the extension so you won't need to change that.
The newsletter sections are needed so that template overrides and user permissions can be assigned to the articles.
If you think it would help I could paste in the notes I made although they might be streamlined to how I used newsletter and not be suitable for you.
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