Maybe he saw a Reddit post the other day which referred to Batgirl in it's title - but the post included a couple of pages of Helena wearing the costume that Cass would inherit a few issues later... i.e. it was in fact Huntress. Notably, the pages in question have Helena ask some crooks, would they admit it if they were beaten by a girl, or would they say it was a tall muscular man? Sowing the seed in their minds that maybe Batman - an urban legend at the time - was in fact female (i.e. her).
EDIT: This one - https://www.reddit.com/r/DCcomics/co...ty_good_point/