Controller & Model Name

What you cited refers to auto-routing controllers.
The autorouter requires consistency in controller names.

If you define the routes yourself, then it doesn't matter what the name of the controller is.
The suffix is used to prevent class name conflicts. But it is not required, as, for example, when importing a model before a class declaration, you can assign an alias.

PHP Code:

// names conflict
use Model\User;
class User {}