Facade design pattern and close coupling

When learning Facade design pattern, everywhere I find this kind of examples:

public class SystemA
{
 public void CreateCreditCard(){//implementation}
 //other methods here
}

public class SystemB
{
 public void CheckCreditCard(){//implementation}
//other methods here
}

public class Facade
{
 SystemA subsystemA = new SystemA();
 SystemB subsystemB = new SystemB();

 public void CreateAccount()
 {
   subsystemA.CreateCreditCard();
   subsystemB.CheckCreditCard();
 }
}

I don't know if I'm wrong but doesn't it create close coupling between the Facade class and the Systems(SystemA and SystemB), even if SystemA and SystemB are inherited from some abstract class or interface.