Those type of "methods" all stem from a frustrated owner who, as a last resort, snaps and punishes the dog in the only way they can think of at the moment.
rub their nose in pee - we don't rub our kids noses in pee and we learn to potty train them, right? Same idea, take them out to potty and WATCH them to make sure they don't have an accident. If someone came up to you and casually mentioned that they potty-trained their toddler by rubbing their nose in pee you'd be shocked and probably call the cops. (No, dogs don't equal kids, but a lot of the training concepts are similar!) I mean, it would possibly work. Or, maybe like with dogs, the toddler would learn to avoid you and hide the fact that they have to go potty, making the job HARDER.
tie a chicken around their neck - again a frustration response. Dangerous? Ya think?? You take a rope, tie a large dangling bird around the dog's neck and leave them out wandering around. Obviously if it is feasible to let the dog wander around with a decaying animal tied to his body you don't plan on spending a lot of time with him. This lets the owner feel like they are "training" the dog to avoid the chickens without having to actually interact with the dog. Besides the risk of hanging, there is the fact that you have an animal wearing a maggoty carcass, can you say DISEASE??
Sorry, just a pet peeve of mine. Is it easy to train a dog to ignore chickens? No, it takes time and a bit of effort. Is it 100% reliable? Not if what you are going to do is just leave the dog unattended with the birds 24/7 then maybe not. Dogs are living breathing thinking animals, so nothing will ever be 100%.