Not sure where you heard that, because it would be a realllllly dumb mechanic if it was true. (GCC in Hi-sec = Concordokken anyways, so it wouldnt matter)
CCP, just go ahead and implement insta-self-destruct already. If Concord monitors everything, controls your ability to lock anything, can insta-warp to your ship and can remotely disable a ship's warp drive, why not just install a simple self-destruct device?
Before you could 'escape' Concord by warping off. You could it indefinitely, and outrun the GCC, but since that was considered an exploit, people just used the 15 minutes grace time to warp around and shoot at several targets rather than a single one.