I've created close to ten accounts on voat because of "locked for..." Really makes little sense if someone decides to ban your account and you can simply create a new account- skews the user data and fills up the server space with dead accounts- doesn't it?
I've never seen that message before, "locked for security reasons".
But I have heard through the grapevine that there is a glitch where if your account is ever banned in any sub, then it prevents you from deleting your account. I'm not sure of the followup to this mess, it could be another 6 months before putt makes a statement.