Whether it is appropriate to run in a cemetery is an very divisive topic on the running forums I read. (I’m guessing non-runners probably lean more toward “it’s not appropriate”.)
Regardless of one’s opinion on the appropriateness for running, I do think it makes sense to keep those streets in CityStrides for “striding”. I traversed the same cemetery that @kevincharlespels references in his reply. As he mentioned, these are named streets, and publicly accessible, so it seem OK to me to leave them in.
I posted this anecdote about a time I did “illicitly” run in that cemetery. Ironically, that post is from a thread of mine in which I was similarly advocating for editing those streets in OpenStreetMap, so that they would not appear in CityStrides. But, I have since changed my mind on that.