Answer
I agree with the friend who argues that the objects should be classified as dwarf planets rather than full-fledged planets. The classification of a celestial object as a planet is not solely based on its size and orbit around the Sun. It orbits the Sun. It is spherical in shape. It has cleared its orbit of other debris.
The third criterion is particularly important. A planet is expected to have cleared its orbit of other objects, either by gravitational attraction or by scattering or absorbing them. However, if the celestial body has not cleared its orbit, it is classified as a dwarf planet. Given that the three newly discovered objects are described as irregularly shaped and smaller than our Moon, it is unlikely that they have cleared their orbits of other debris.
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