Theyre from the genus Urocyon! Which actually evolutionary predates Vulpes. Gray foxes not being part of Vulpes does not mean they are not foxes in the scientific sense, but in the sense of it being an animal which behaves, looks like a fox, so we still call them foxes.
Sorry if this is a dumb question, but animals like this just evolved from other ancestors, but have similar traits correct? That’s why we still consider them foxes?