Well, just maybe he left it live long enough for the monitors to reach a ready state when the emissions test was coming up. I know it would not work here in PA unless you left it 'live' for long enough to pass. That feature was part of the OBD2 system to prevent folks from just disconnecting the battery to get rid of hard faults long enough to pass.
Also, your information is ANECDOTAL. Perhaps true in YOUR case, but maybe not in every case. Some cars are more tolerant than others. Programming does vary from year to year and manufacturer to manufacturer.
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