The reason why Earth Core People are said to be akin to celestial life forms is because the material composition of the Earth Core People is similar to that of planets, especially since their bodies resemble cooled magma after death.
The reason why Earth Core People are said to be biological life is that scientists have learned through research that the way Earth Core People's bodies function relies on biological currents, just as ordinary biological life does.
But to thoroughly unravel the body structure of Earth Core People, we must start from the beginning.
Initially, after bringing back the corpses of Earth Core People for research, the scientists responsible for the project found themselves in a quandary.