That is probably why it isn't working for you. That was just a DEMO variable I used to represent the actual one (which would be in the module you are trying to edit). I do not have that module in front of me so I don't know the exact terminology.
"MODULE_SHIPPING_COD_STATUS" is the Constant that refers back to the language file for that module (cod).
To make it work, you should replace that with the proper constant value (found in that shipping module you are trying to edit).





