Best to raise your chicksns indoors, or, if you can't, eat those eggs and forget about it.
Putting this as politely and delicately as possible, BS. Like all livestock, chickens require appropriate shelter in cold weather. I do not recall that anybody ever heard of bird flu or burying chickens with backhoes until they began to be raised in industrial facilities a few years ago. I’ve raised several chickens and have a vague idea of what I speak.