The question now is who hacked his account because that is some pretty shady stuff over some petty shit.
Can you use some Global Mod powers to see if there are IP matches?
No, only admins. You can ask them to look into it, but they likely wont. Whoever the hacker is they probably used a proxy or something anyway, or at least they would if they were half-smart. I'd be surprised if they were using the same connection that is linked to their other accounts but you never know.
This is a lot to keep track off. If the account was really compromised, why would the user only reveal such information?
What else is there to release, but he obviously had a motive for realising it and has some personal beef with the people involved/exposed.
If this version is true, I would suggest bitcoingirl.club posts their email provider (bpip states that the password was changed via email), as the ease of this supposed back raises some serious privacy concerns.
I'd be interested to know which one it was as well, or how his email was likely compromised.