I doubt this guy actually has the info he claims to have, why?
1. He would need to stalk everyone in the forums, one member a day, which is next to impossible, not to mention creepy
2. By using info he has accumulated on the forums against a member, he risks being banned and charged with cyberbullying
3. Why would he want all that info anyway, that just makes him seem even more creepy, and puts him at even greater risk of being banned for security reasons.
Overall, i think this guy is lying though his teeth.