.osx hiding menu bar icon doesn't work (Yosemite 10.10.1)

# Disable Notification Center and remove the menu bar icon

launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist 2> /dev/null

This does disable the notification center for me but the button in the menu bar is still there.

Start by reading the .osx configuration and the launchctl command shown in the issue, with attention to how Yosemite handles Notification Center. Verify the behavior on the reported macOS version and identify the configuration change needed to remove the menu bar icon; done means Notification Center is disabled and the icon no longer appears.

Written by the indexing model from the issue text.