In California, when the attorney general will not enforce a law, the proponents who brought the initiative to the ballot can legally defend it in court, which is why the CA courts rightly granted standing.
Read the portion of the transcript where Justice Breyer addresses public actions. It's close to the beginning of oral arguments - like 3-4 pages in. The link is in a previous ping I sent you today.
I heard it and thought thats what it was about. The justices aren’t talking to the attorneys or the public. They’re talking to each other.