Shame on whoever put in the words 'People with breasts', but in fairness, the aim of the exercise is not misogynistic, it is to make sure that women get CPR when they need it, and to train paramedics to be prepared to do CPR on women's bodies - even women's bodies where the breasts are bound.
I think basically this is a positive idea, ruined by the 'PWB' thing - paramedics may occasionally encounter a male 'person with breasts', but these CPR/defib instructions wouldn't be any different because the 'breasts' were attached to a male body.
So they'd use their common sense 'oh - this is a man with breasts - right - let's get going' and proceed with the correct CPR/defib-with-breasts procedure, regardless of the sex of the casualty. Ditto finding that the 'male' casualty is a woman wearing a binder, so again: proceed with the correct CPR/defib-with-breasts procedure.
'Woman' would have worked perfectly well instead of 'PWBs', and it wouldn't have drawn this negative attention towards something that is positive for women.