They will pick up on it, without that. Many a time, I have successfully put store bought day old chicks underneath a broody hen. Works a treat, and you can freshen your flock without a rooster.
While I think this is a perfectly admirable way of keeping chickens, one would do better to indicate it is the way they do it themselves.
Animal abuse, hypocritical are pretty harsh words when assigned to someone, whose coop you do not know, whose circumstances you do not know.
Personally, I have used a broody, I almost always do, but Mrs. Feathers had raised two clutches earlier, and was 5 years old. I broke her. No abuse, long term health benefits.
I have culled chickens, butchered, canned and cooked them. I have also boughten chicken in the store. It was handy and clean and tasty.
There are many ways to skin a deer. Lets look at all of them.
Mrs K