I appreciate the concern (doubly so for any thread readers unfamiliar with Yews).
I know true Yew berries are a mild treat on a lethal tree (not worth it IMO), but Cephalotaxus is a "yew" in name only, not closely related to the Taxaceae. It's in a separate family, with several species having edible berries and/or nuts (on non-toxic trees) or medicinal qualities (which I don't know much about). Besides, while the foliage is similar, the fruits seem very easy to tell apart. Provided you know what you have (which shouldn't be too hard if you know what to look for), Cephalotaxus definitely seems like a worthwhile fruit/nut tree if you have a tasty variety. Besides, I have a feeling I could grow it in my neck of the woods no problem (I don't think true Yew would survive here).
So... Does anyone have any direct experience with Cephalotaxus as a food plant?
Edit/P.S.: Cephalotaxus has edible pulp and seed kernel. I can't stress enough that while Taxus pulp is edible (yet mildly flavored), the seed and the rest of the tree is lethally toxic, and there is risk that you could ingest unintended plant matter with the aril. Again, Taxus is lethal; don't try it.