They aren't confirming anything. People are looking at wallposts and thinking/remembering they are private messages, but everyone that has tried to verify using email notifications has found only wallposts. Until someone shows that a verifiable private message showed up publicly, than there's no reason to continue spreading this. If it's a problem, it can easily be confirmed. Even Techcrunch, who criticised Facebook's response have now backpedaled.
"Same here, my wife just called me crying because a large number of very private conversations she had with friends in the past are now visible on her timeline."
Sounds pretty clear to me, I figure that the lady knows which conversation were private and which weren't, if only by their content.
Look at his edit, she isn't entirely sure they were private.
Amazing how many people have "confirmed" it but nobody has posted anything verifiable. Just a screenshot of the private message inbox/email + the post on the timeline. Redact as much as you want.
I've gone through the messages on my timeline, and truth be told I don't remember the context of a lot of the messages, so it wouldn't surprise me if people don't remember if something was private.
This feels like the "everyone go find weird stuff in your Wendy's food now" situation all over again. Except explained more by incompetence than malice.