Dunno if this has been posted in German but:
I tested it today, and unfortunatly it doesnt ACTUALLY work. I had a friend test this macro on me to experience its results for myself. The player you use this macro on will not actually get kicked from the Raid they are in, it will only appear to them as if they have been kicked. They will not see themselves as being in a group or have any raid memebers in their list. For the other members of the raid group that person is still actually in the raid, they still see him. The target of this macro will still be able to hear what the other raiders say. Essentially all the macro does is create the illusion for the target that they have been removed from the raid. On the server side however, they will not get kicked out of an instance for not being in the group (as the server still believes he is in the raid) and any targets the raid engage will still be lootable by the target of the macro. The only use I could think of for this little bug is to use by targeting the healers of a raid guild that you dont like. They wont see any fellow raiders so they wont have any CTRA bars to heal. Otherwise the bug is simply good for giving a player a quick scare and nothing more.