Kimber got the privileges to use this locking mechanism from Sony. So it should be, but I can not confirm it because I don't have it.
how about holding the wires under the lock, and twist to turn it ? See if it turn or rotate inside the socket when locked in ?
Thanks, good to know. If I would be paying a grand for a cable at least it should have plugs that fit like they should else there's no point in spending money on the cable itself.