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Sorry, but that theory is bunk.
First of all, many of us here free range and do feed chickens meat based diets, and all of our chickens poop copiously all night, too. There goes the theory right there.
Secondly, have you ever taken a close look at a chicken's dropping? There's absolutely nothing, and I mean nothing, undigested in there. A chicken's digestive system is so efficient they have a pair of cecal glands with special bacteria that break down even the most fibrous stuff. That's where cecal poops come from.
Thirdly, have you noticed chickens go to bed frequently with full crops? That's so they can continue digesting food throughout the night. What goes in has to come out: hence those droppings throughout the night.
I can't speak for all birds, of course, because I only have personal experience with three kinds of parrots and one kind of doves. But these birds all poop during the night, too.