ididntwanttomakeanaccount
Is there a way to fix this so I can disable that notification as well? I don't want any notifications
Apart from the fact that system updates are obviously important and therefore the notifications about them are too (and probably greyed out for a reason): If you are only concerned about the reboot notification, you could toggle on Settings> System> System updates> Automatic reboot.
The device will reboot automatically after an update, and there is no reason for the system to remind you.