The person I bought my birds from used a cockatiel nest box, and I've been told they won't breed if I use that box. Some people told me to use a metal box. I also received different information on diet. Some said seed, some said nothing except pellets, some said mix pellets and seed, and one person told me I have to feed breeding birds high-protein pellets and nothing else. Another said conures can't have high protein.
People are unique, and they do things in dissimilar ways.
Bird breeders are no exception. You can talk to 10 different breeders on the same subject and get 10 different answers. The 10 different answers you receive could be all right, all wrong or a mix of right and wrong answers. Bird breeders tend to do things differently from each other even if they are working with the same species. It can be confusing and frustrating because what works for one person may or may not work for you.