Do they mean:

Who's they? You are reading a text written by Angelina Jolie for a general audience. She has to make certain that no woman reader who reads the story comes away with thinking that she also has a 87 percent risk.

I understand that not everyone is a Bayesian black-belt, but I am trying to figure out what implicity assumption motivates people to talk this way.

What does a Bayesian black-belt do, when the only numbers he has are come frequentist statistics that someone else did?