Yes it does because most of your opponents are camping. After you die in hardcore, you have to spectate. You will see 4 out of 5 of your teammates are camping and guarding one approach. You can count on most of the other team doing the same. Doesn't matter how slow you move or how often you look behind you. UAV's are rare so cold-blooded only helps against heart-beat sensors, which I've found most people don't use.