My chickens love 1/2 the things, that I recognize, on that list. I agree that everything in moderation.
My chickens don't eat the cherry pits, neither do my goats. (The chickens pick the cherry flesh and leave the pits, the goats actually spit the pits out.
) So it's dosen't matter if the pits are bad for them, since they don't eat them.
Most animals will avoid poisonous plants, unless there is nothing else to eat. If they are allowed to run wild like mine, they eat what they want and stay healthy. If you keep them penned up, then don't give them too much of any one thing. (This includes commercial feed. Have a heart and give them lots of treats.)
My chickens have nice, shiny feathers. They look and sound healthy, and they eat everything. I was at a auction yesterday and I couldn't believe the horrible condition that the chickens were. Yes, some were very fat from eating lots of commercial feed, but their feathers, feet, beaks, and combs looked dull and unhealthy. There must be something very healthy in bugs, slugs, grass, and clover. (And everything else that they decimate.)