If you're in a field in a windy day you cannot tell where the wind is originating from. If you're in a room with a fan turned on, you can tell where the wind is

If you're in a field in a windy day you cannot tell where the wind is originating from. If you're in a room with a fan turned on, you can tell where the wind is being sourced. The source of the wind has been localized in this latter scenario, whereas in the first you can detect the wind but you can't tell what the source of the wind is. That's the gist of the local versus non-local neutrinos being detected.