What? are you serious? No hacker can change an old email. There are dates aside, nobody can change that. It is the past. I have the email when I registered the ADMIN can check the dates.
Let me try and break it down into a timeline, you don't seem to understand what I am trying to say.
1. You make the account with the original email,
2. The original email account gets broken into. The hacker notices the sign up email from Bitcointalk, sees your Username and thinks 'I want that account, it can be worth money'.
3. The hacker posts here, saying that he owns the account and has the original email to prove it.
The original email hasn't been changed. The dates haven't been changed. If the administrator were to use this proof, there would be no way for them to know it wasn't the original owner of the account. Do you understand why this can't be used as proof yet?