late static binding in object context

I don’t understand how this example from PHP documentation works :
https://www.php.net/manual/en/language.oop5.late-static-bindings.php
I quote from the doc “In non-static contexts, the called class will be the class of the object instance” means if i add an echo get_class($this) in method test it will display B then C, the first one is then a foo from B (foo is private in A so there is no foo in B), and the second one is a foo from C, and this means it should call the private empty foo from C ? but that’s not it!

<?php
class A {
    private function foo() {
        echo "success!n";
    }
    public function test() {
        $this->foo();
        static::foo();
    }
}

class B extends A {
   /* foo() will be copied to B, hence its scope will still be A and
    * the call be successful */
}

class C extends A {
    private function foo() {
        /* original method is replaced; the scope of the new one is C */
    }
}

$b = new B();
$b->test();
$c = new C();
$c->test();   //fails
?>

Output :

success!
success!
success!
      
Fatal error:  Call to private method C::foo() from context 'A' in /tmp/test.php on line 9