Our new errata system is at https://errata.build.resf.org/. The old errata page you’ve linked should soon redirect to the new one. At the present moment, it does not send automatic emails yet, but it is on the radar as a supported feature as we do see value in it. Unfortunately I don’t have an ETA on this just yet.
While the wiki page isn’t complete, it’ll soon have more information on the new errata system: Rocky Linux Errata - Rocky Wiki