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It may be diversionary if done some distance from nest, but most hens do it so close it has to actually attract attention to nest site. With my doms last year, I could use sound to narrow down where to look for nest. Games hens on other hand I had to actually see where she was walking from.
Yes, most hens do sing the eggsong too close to the nest for it to act as a diversionary tactic, but I think it's still ingrained in them (from their ancestors) and that's why they do it; even if they pick the wrong place and time.
I have a hen singing the egg song right now. She's been at it for a good 15 minutes. Problem is, she hasn't yet gone to the nest to lay. She started singing it the minute she entered the coop and is continuing it while she looks for the right nestbox. Again, she probably doesn't have a clue WHY she's supposed to do it, she just knows that she's supposed to.
My hens very quite when approaching nest site and while on it. I have been able to watch whole sequence repeatedly now involving hens nesting on front porch. When vocalization made (after egg layed and hen moved off nest) , it is of very short duration with rooster responding immediately. My birds not going into a henhouse so may be a factor causing different observations.