I locked this account already but, I don't know whether he is able to recover the account with this signed message.
There user will be questioned to verify the email address you've used during your registration. If he appears unable, then what you're claiming will be confirmed.
He even replaced my Stake affiliate link with another one.
What's a stake affiliate link? Do you mean that you had staked an address prior that message? If yes, there are ways you can search for deleted or edited messages.
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https://ninjastic.space/-
https://loyce.club/archive/posts/