The thing that involves cooking fowl and foil is wrapping the breast area of a full bird (particularly a very large one like a turkey) in foil because white meat cooks more rapidly than dark meat. By the time the dark meat has come up to temp the white meat can be overcooked unless you figure out a way to make it cook more slowly, which foil does nicely. But if you're not doing a whole bird it's not really an issue; chickens might be small enough that it's not really an issue with them either.
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