I think that where Erich may be going is that a dead body is still a body. If you visit a morgue and ask what’s in the box, the answer is: a body. Even if it’s dead.
His question may come from Catholic Apologist John Martignoni’s argument regarding Faith vs Works which states:
James 2:26: “For as the body apart from the spirit is dead, so faith apart from works is dead.” There is an analogy here: faith = body; works = spirit. So, a body without a spirit is, as everyone knows, a dead body. It is really a body, but it’s a dead body. So, if faith is analogous to the body, as Scripture says, then faith without works, is really faith, it’s just dead faith. Thus the question: Is a dead body really a body? If they [Protestants] say, “Yes, a dead body is really a body,” ; then they cannot afterwards claim that faith without works is not really faith as that would contradict the analogy we find in James 2:26. If they say a dead body is not really a body, then they have just stated something that is truly idiotic and you need to drive them down to the morgue and ask them what those “things” are in there. So their choice is to answer in a way that contradicts one of their beliefs, or to answer in a way that is patently absurd.