You are not using rcon once in the whole video.
We don't have the locked down console of vanilla IW5 but have a full blown one.
You could have noticed this by the absence of the word "rcon" in the console.
So instead of changing the map on the server you told your game to disconnect and load the map as if you would do with a private match. Which also explains the second bug, which is a known one btw, once again it shows you are no longer connected to a dedicated server as you have the end game option instead of the leave game one. I guess I don't have to explain the ping.
The crash on the kick command is because you are kicking the host out of the game, which should not be possible. RektInator has to fix that.