They deliver patches within a month. I don’t think there is that many critical vulnerabilities as AOSP has a small attack surface by design.
I really recommend reading more about Android Security Bulletins.
Graphene isn’t this magic OS that has patches faster than they come out. They are still dependent on the Android security team.
Obviously. But they also never claimed that. They at least do the bare minimum of delivering patches in a timely manner. CalyxOS takes a month, while GrapheneOS almost always does it on the same day. There is no excuse for taking a month to do this, unless you don't really care about the security of your users, and you are misleading them, and giving them a false sense of security.
This is just pure speculation about a theoretical possibility and no counterargument to the fact that CalyxOS repeatedly missed important patches for months. Stuff can go wrong in any software release, including billion-dollar companies like Crowdstrike. Software is still written by humans, which have a very natural behavior of making mistakes. But please show me one broken GrapheneOS release from the past decade. This argument just makes no sense.
GrapheneOS always goes through extensive (including automated) testing before releasing anything. As I have explained many times, these guys actually focus on quality, security and reliability. Also, we're talking about ASB patches that are provided by AOSP, so if something goes wrong, not just GrapheneOS will be broken, it would affect all AOSP-based systems that deliver updates in a timely manner (Calyx of course not included, they don't give a fuck about delivering updates in a reasonable time)