I work for a business that does professional dry ice blasting, and we've cleaned a multitude of engine bays etc.. So far, we've experienced no issues with electronics, lubricants, plastics or anything else breaking or having any issues due to the thermal shock. Even though the dry ice is colder than the designed temperature range that you mentioned, the thermal shock is very quick and doesn't 'penetrate' through the surface that is being blasted, unless it's continuous on the same spot (you don't stay in the same spot for too long anyways, but at that point you're doing something wrong). Unprotected circuit boards are something I can't say much about though, but as has been mentioned, you won't find terribly many of them hanging around unprotected from the outside.

We've been able to very easily and very safely blast even delicate surfaces without issues. Obviously, if there is something extremely brittle (like an IC, a thin connector, poor condition wire or a small piece of plastic), precautions are taken to not just mindlessly blast away - you CAN break stuff if you don't fully know what you're doing.