I believe you are correct and that it comes standard when you have PDLS+ (is that LED only now?). When I had the apple carplay and maps added to my car, sima indicated that camera allowed activation of many features.
However, I don’t know if there are other components needed (sensors/ect) to make them work. My car doesn’t have BSM so there are no indicators on the door to light up, meaning I’d have to add those as well. I’m a big boy and know how to adjust my mirrors correctly, so that’s not an option I’d look to add. Now if I could get the cruise control to be active, I’d do that. I may have to reach out and see if that’s something he can do.