That was just a GPS (?) update. I have an S9 too, if you check the security patch level (Settings > About phone > Software information), it’s still at March 1, 2022 (and there aren’t any further updates scheduled).
What's the latest security update? I just checked S9 I have in a drawer and it's from March 2022.
My ultra cheap, as in free, Samsung is running Android 12 with security updates from October 1 2022.
“Free” means paid through your contract though, so that doesn’t really add anything to your point.