Hmm, mentioning HDD cables made me think that they didn't measure the temp of anything else in the PC. Maybe other components like HDDs would get hot? Not something I ever think about, no idea what a safe temp for HDDs/SDD/Optical drives would even be.
Cable management isn't something I'm going to worry about though. But I'm no expert, just going off a couple things I've seen/read, like that youtube video.