There is no way to deduce whether the story is a historical events, or fictional. It seems you pick the red bra as your sticking point to show the improbability of the story being factual. However, as I pointed out, Chong Ying Street provided the means for people to obtain red bra, and that wasn't the only possible means. That makes your argument about the possible inaccuracy very weak. If JZZ said it was true, you couldn't have drawn other conclusions based on what you'd learned from the story and the events in that period of time.