It's a House race, not statewide! Sheesh!
I don't know, but Harlem isn't that small, and Inwood and Washington Heights are separate, distinct and north of Harlem. In the 1990s Rangel's district extended, maybe it still does, into the Marble Hill and Kingsbridge neighborhoods of the Bronx, just north of Inwood.
"In his hand, Louis held a thick sheaf of papers showing voting data that, he said, had zeros for Espaillat in neighborhoods like Inwood and Washington Heights places where the state senator has strong levels of support."