The problem doesn't have anything to do with FSDT KORD.
Red X are an indication from SODE that some add-on it's trying to create objects using SODE, because a SODE XML/SDX file for that add-on is still present, but the objects themselves cannot be found. So, the most likely issue in your case, is that you haven't removed the SODE definition files for DD KORD, located here:
%PROGRAMDATA%\12bpilot\SODE\sdx
or here:
%PROGRAMDATA%\12bpilot\SODE\xml