Re: court
This is more a "legal" than a "code" issue, with a little "design" thrown in as well.
Was the 2002 applicable at the time the plans were approved- or did you go beyond the adopted requirements?
Personally, you are immune (see Malfeasance).
"The law is an *** ." Engineers think 'more is better.' Anyone in the trade can relate problems when GFCI's are connected to refrigerators, compressors, dishwashers, sump pumps, etc.
If it makes you feel better, the new UL tests for GFCI's (applicable to all new manufactured GFCI's) aresupposed to ensure a greater resistance to such nuisance trippings.
How large can a 20a/120v. fridge be? Was there actual spoilage- or was "spoilage" defined by what the chart recorder said? My home fridge, when full, can maintain its' tempfor quite a while.
Tech solution: hard wire the fridge. Sure, you'll need a disconnect; 400.7 would allow you to use a flexible (SO) cord. That way, there is no "receptacle," only an "outlet."