Admins would have access to exactly the same info that unregistered BLP subjects have access to In other words if Kumioko posted using his employers internet facilities while being logged out in order to evade a block or ban then BLP subjects could see the IPs used for that abuse just the same as admins could  It has also been suggested that some or more than some of the abusive behaviour has been via email It may be that some IP addresses were disclosed that way Not all email providers hide the IPs of people sending emails through them