But my point is that the existence of universal moral values do not prove the existence of absolute moral values, because universal moral values can also arise

But my point is that the existence of universal moral values do not prove the existence of absolute moral values, because universal moral values can also arise in the absence of absolute moral values (or it would have to be demonstrated that they can't). That every moral agent agrees that murder is wrong does not prove that murder is wrong independently of any point of view.