I thought that *was* a nice benefit, but no more. LH SENs only get access to domestic RCCs if their domestic segment is part of an itinerary that includes international travel (i.e. the same as UA PE non RCC card holders).
They (UA) tried to do that for about two months, but had to step back. No it is entry again on UA domestic flight segments for all StarGold status holders except their own.