Doc. of final method getReplaceModel says it can be overridden

[Ann Baert]

The "getReplaceModel" method of the AttributeModifier is declared protected & final, and its docs say that it can be used in subclasses.
I use wicket 1.3 beta 2
How can this final method be overridden in subclasses?
Is this a misperception over here, or is this a documentation or an API mistake?

protected final IModel getReplaceModel()

    Gets the replacement model. Allows subclasses access to replace model.