Those are not the only two options.

Besides, we still routinely fail to spot asteroids until they get close to Earth or pass by.

There may be more dwarf planets like Pluto, or a major planet the size of Neptune (per Caltech researchers, so called Planet Nine or Planet X) in our own solar system and we can't easily find them.

No need to intentionally hide from the primitive humans that are still struggling to locate large objects in their solar system and near their planet.