Of course there would be some electrical load shedding if the aircraft dispatched with one generator u/s THEN the APU battery failed and THEN the main battery failed and THEN there was an engine failure on the engine with the two good generators, not the one with the generator U/S.
Even in this extremely unlikely scenarion where 4 unrelated failures have somehow occurred, there is STILL a 235 Vac variable frequency generator working and a Ram air turbine, or shall we say "yeah but what if they failed too?"