How does var-arg affect overloading?

Question

class Student 
{
     void cal(int ...x)
     {
         System.out.println("Parent");
     }

}


class HelloWorld extends Student 
{

    void cal(int x)
  {
    System.out.println("Child");
  }

    public static void main(String... args)
  {
        Student ref = new HelloWorld();
        ref.cal(10);
  }

}

OUTPUT: Parent

While compiling, the compiler checks whether cal(int) is present in Student class or not. Once confirmed, when running the JVM tries to match the cal(int) based on the runtime object i.e. HelloWorld in this case. So it should match cal(int) with cal(int x) and the output should be "Child".

So then why is the output "Parent"

Above logic derived from: https://stackoverflow.com/a/70903492/13146358