Are you sure? I had a 2006 (Calais), 2007 (Clubsport R8), 2008 (Calais V), 2011 (Calais) and 2012 (SSV) VE or VEII and not one of them had a deadlock feature. The interior "snib" would always unlock the locked car no matter how many times the lock button on the remote was pressed.
Actually now...