atom + plugins, not just atom. Same with vs code. If we count plugins, emacs and vim are both ide's as well.
Plus, IntelliJ and Eclipse BOTH implement ALL of their functionality as plugins. It's just that they come with a default set of plugins pre-installed.
If you don't count the plugins, it's barely even an editor (even syntax highlighting is a plugin).
And I agree with the last part as well. Properly configured Emacs and vim can be used as IDEs, however they can also be used as editors.