System Integrity Protection status: disabled.となってる（SIPが無効）ことを確認して。
launchctl unload -wF /System/Library/LaunchAgents/com.apple.OSDUIHelper.plist
-w If the service is disabled, it will be enabled. In previous versions of launchd, being disabled meant that a service was not loaded. Now, services are always loaded. If a service is disabled, launchd does not advertise its service endpoints (sockets, Mach ports, etc.). -F Forcibly load the service. This flag will ignore the service's disabled state. In previous versions of launchd, this flag would also ignore the ownership and permissions of the specified launchd.plist. This is no longer the case. Note that, unlike the -w flag, this flag will not modify the service's disabled state; it will instead only ignore it for the load operation.