My 2 €ct
I doubt many people are capable of distinguishing among the different yew species. In fact, by some, all eight or nine yew species are considered to be a single superspecies.
So whether or not it's a hybrid (how did you identify it as a hybrid?) is likely irrelevant to its properties as bow wood. I guess the quality of the stave in itself matters more than of which particular variety of yew it originated from.
Joachim