Parmenides describes the human being as something, which is very stable. As something not movable. As something that does not expand. Something that is clearly delimited from nothingness. At that point I would only describe the terms, not discuss them. There are probably more than only one interpretation of Parmenides´ theory.
The being is clearly eliminated from the nothingness. But there is more. There is no nothingness in his description. Because in a nothing nothing can exist. If nothingness does not exist, if everything is enclosed, there is no possibility of expansion. Because where shall we expand, if there is nothing.