Because they believed they could count on these people, yes. She and her attorney are the ones who gave every impression they were interested in going public. Her attorney even went so far to discuss this and suggest he'd ask the NRA to release them of their confidentiality agreement.
All that was AFTER the Politico story. There was no interest before that.
Indeed, since the woman won’t come forward and still stands behind her allegations, this disproves the “she’s a gold-digger” trash-talking as well.