TestyYuba385 Correct, upstream means that it is an issue which also affects Stock OS, as a result of being an issue in AOSP (Android Open Source Project), which both Stock OS and GrapheneOS are based on.
GrapheneOS sometimes addresses upstream issues downstream (in some cases months before they're addressed upstream), but there's too many for our team to address, in addition to them being things that will eventually be addressed by the Android team, meaning that it is not the most ideal use of the project's development resources.