No. I'm saying Ensign Watkins from THAT WHICH SURVIVES is the only black crewperson to perish in clasic TREK. He's also the final crewman to die in classic TREK going by stardate and episode production order.
There is SOME merit to the black-man-dies-first urban legend in movies, though I think it's less true for TV shows of this period. It is true they had usually much less dialogue on TV.