No need to remove the cable tie as far as I can remember.
If you look at the last pic I attached, you can make out the cable tie on the left hand side of the plug plastic cover, this cable tie holds the loose cables onto the plug body after they exit the moulded rubber of the loom . I guess that is the one you are thinking about.
So when you get the loom free from the
just check that no cables at the back or underneath were also damaged by the "Tamper Proof" cover.