Hi The edit was put there by the user themself  it was a request to have their Autoblock removed and they obviously changed their mind Its all good though why they are using the same IP address as a vandal may be worth looking into Removing warnings or block notices is not usually a problem If they are a vandal they will be blocked no matter whats left on their talk page and if they are blocked and the removal of the block notice is seen as disruptive then their talk page can be protected WPUSER has the details