How does the emissions testing stations in your area conduct their tests? Do they hook up their scan tools to check to see if the PCM reports a certain diagnostic test has run or not? If so, then just disabling the code will result in these tests always showing "NOT RUN" on the scan; and disabling the diagnostic may result in the same thing being displayed.
I'm not sure what Overkillwill does, but you had better check to make sure whatever he does to disable the diagnotic test from running will report that diagnostic test result on the scan has "RUN AND PASSED"; otherwise you'll probably fail the inspection (that is if the smog guys are looking at this data).