I think that when they say "story teller" (قاص), they meant one who told stories of the Prophet, PBUH, (Seera) and his fellows (Sahaaba). That involved many hadeeths.
Just realized that this explanation is very important. If he was telling hadiths, then he should know the abrogated and abrogating since the abrogated hadiths are no longer valid. Is there a reference we can cite for this characterization of قاص?
Islamic literature has been very harsh on story tellers القصاص, and books have been written with titles such as أكاذيب القصاص (Lies of the story tellers). They were mostly people making up sensational, emotional stories to gather the unaware public around them and gain popularity or charity.