java command pattern example with Runnable class : Is Receiver missing?

From Examples of GoF Design Patterns in Java's core libraries question, it was quoted that

"All implementations of java.lang.Runnable" are examples of Command pattern.

As per my understanding of Command pattern,

Client calls Invoker => Invoker calls ConcreteCommand => ConcreteCommand calls Receiver method, which implements abstract Command method.

Have a look at this working example

Command pattern UML diagram from this article is shown as below.

Have a look at this code:

public class ThreadCommand{
    public static void main(String args[]){
        Thread t = new Thread(new MyRunnable());
        t.start();
    }
}
class MyRunnable implements Runnable{
    public void run(){
        System.out.println("Running:"+Thread.currentThread().getName());
    }
}

1. ThreadCommand is Client
2. Runnable interface is Command
3. MyRunnable is ConcreteCommmand
4. Thread is Invoker with start() method calling ConcreteCommand implementaiton ( which calls run() method)

Is Receiver missing here? Or MyRunnable plays combined role of ConcreteCommand and Receiver?

Thanks in advance.