I would differentiate "one body" from "the one body" or "the only body." While I didn't explicitly state, "one of many," that was the implied intent.

Another example of similar usage is, "I am one person." This statement does not imply I am the only person. Rather, it eludes to the fact that there are others.

This is just a guess but, while looking through my post and these responses, it appears to me that you are politically charged and might be reading with a heavy confirmation bias. I welcome evidence to the contrary of any of my points. So far, I've only seen conjecture.