Unlike most other game engines, Godot has been designed from the very start to build a very specific application... The Godot Editor! Features for building the Editor have been added to the engine since the beginning of development.
It also supports a collection of component libraries for most use cases of LOB application?
Integration of desktop and mobile OS APIs for OS and interapp communication and extension workflows, e.g. tray actions, file management context menus.
Your questions would be perfectly cogent and understandably pointed in response to such a claim, but the author clearly isn't proposing that.
(and I noticed the comment you were replying to was from the author thereof so under the circumstances it seemed reasonable to use what he'd written about it long form as context)