You know what, you're pretty ignorant. I'm a chicken rescuer in Michigan. And YES chickens do freeze to death in cold weather. Don't be feeding people the wrong information if your not a professionalIn most of the threads you are reading I guarantee there are underlying issues. The keepers won't admit or don't know it, but there is. Chickens don't freeze to death in even frigid, well below zero temperatures unless there are extenuating circumstances. Unfortunately, those threads where people claim their "perfectly healthy, perfectly well taken care of" chickens "froze to death" create panic in those that don't know better and spur posts like these that further create a 'chickens-can't-handle-cold-temperatures' hysteria.
You've got some good advice here -- pay attention to your chickens, know their individual needs and provide for them. Absolutely, but don't misunderstand -- most chickens are more than capable of withstanding incredibly low temperatures with only very basic accommodations.