Albus Dumbledore had been wrong about Voldemort's horcruxes. There had never been just seven—or eight, technically, if Harry's scar was being counted. There had been seven hundred and seventy-seven.
Definitely an interesting concept and a missed opportunity. This could have been the new adventure added to the Dramione scene, with long chapters and a slow burn enemies to lovers. But the author wrote this as a one-off. It was too short!