The thread has that line of his statment edited to strike the line so it looks like he changed his mind after it was pointed out how he could leave it up to server owners if they want it to run on the server or not.
If you have a copy and want to allow it to run the thread points out what statement in the script needs to be changed.
Rather than limiting use of this with (missionName = ""), which means it is only available in SP missions/editor, please just use (isServer), which will still allow its use in SP missions/editor, but will also allow it to be used in the MP editor or if you are playing as the host in an MP game.