Article III of the U.S. Constitution says in part:
...”the supreme Court shall have appellate Jurisdiction, both as to Law and Fact, with such Exceptions, and under such Regulations as the Congress shall make...”
Did Congress write a law that defined “standing?” (I’m not a lawyer, so I don’t know).
No they did not. So as always, earlier Supes just “wrote” a law and subsequent courts abided by it.