Theory: AT&T has a known relationship with the NSA. Maybe the leak was due to an NSA screw-up. In that case, they're telling a half-truth but wouldn't be allowed to tell the whole truth.
Theory: Someone at AT&T suffered a traumatic brain injury, posted all this data, forgot about it, quit, and is now living in a cottage somewhere in the mountains of Canada.
The NSA screwed up and it ended up in the hands of someone who routinely hacks into large corps?
This doesn’t pass the basic smell test. I really don’t want HN to fall down the conspiracy hole that much of the internet now has. It’s eating away at our societal fabric and is wrong 99.9% of the time.