If the whistleblower had been taught abusive techniques by her coach, it wouldn’t exactly be surprising that she applied them. Her lawyer said that she though those methods were the correct way at the time, but she has since learned that they’re cruel. She feared, but expected, retaliation and victim blaming. And, you’re right. Two wrongs wouldn’t make a right. Besides, fair or unfair, the public holds Olympians to higher standards.
I’m not sure how someone would prove who took the video and that they’re featured in other footage anyway. I hope that anyone trying to out the whistleblower will be sure that they’re correct before sending a victim blaming mob after someone.