I didn't see this new message in the AOChat.php

you need to add this:
0x13f08a9 => array(AOEM_ORG_KICK,
"{KICKER} removed inactive character {NAME} from your organization.",
"s{KICKER}/s{NAME}"),
right after line 2015 in AOChat.php.

There is this in the top of the file:
define('AOEM_ORG_KICK',               0x11);
I am not sure if the new message actually comes across with code 0x11, but I am not sure that it really matters.