That is not true...God can bring anyone back to life He so chooses...He created life in the 1st place...soul is not a separate being from the body...living beings, animal or man, are living souls, dead beings, animal or man, are dead souls...Jehovah has the power to kill a person/soul, He has the power to bring them back to life...there is not one case in the entire Scriptures, Hebrew and Greek, in which the words, nephesh/Hebrew for soul or psykhe/Greek for soul, are described by terms such as immortal, indestructible, imperishable, deathless...
Matthew 10:28 states, "And do not become fearful of those who kill the body but cannot kill the soul; rather, fear him who can destroy both soul and body in Gehenna."