Well that's a semantics issue. Niven might argue that since the egg-producers don't gestate the young they're fulfilling a "male" role of merely producing gamet

Well that's a semantics issue. Niven might argue that since the egg-producers don't gestate the young they're fulfilling a "male" role of merely producing gametes. But I'd argue that the female role is defined more by producing egg cells than by gestation: female fish produce eggs but don't gestate their young, and we still call them female. Therefore the "male" puppeteers that produce eggs are still truly "female".