STC: AIC cannot resolve overridden method of outer class

import groovy.transform.CompileStatic;
interface HelloWorld {
    public void greet();
}

class HelloWorldAnonymousClassesParents {
    public void hi() {
        println "hi"
    }
}

@CompileStatic
public class HelloWorldAnonymousClasses extends HelloWorldAnonymousClassesParents {
    public void hi() {
        System.out.println("hihi ");
    }
    public void sayHello() {
        HelloWorld spanishGreeting = new HelloWorld() {
            public void greet() {
                hi() //<- here [Static type checking] - Reference to method is ambiguous error
                System.out.println("spanishGreeting");
            }
        };
        spanishGreeting.greet();
        hi()
    }

}
def myApp = new HelloWorldAnonymousClasses();
myApp.sayHello();