I would argue that the simple fact that we observe “anything” tells us that there is “something” as opposed to this ontological concept of nothing. Its not replacing the Epicurean or Lucretian formula but if anything bolstering it from a logical perspective in my opinion.
The mere fact that Parmenides used the Epicurean Canon of his observation of things within his lifetime since he was a physical human being like us tells us he observed things like you and I do. He made his logical very abstract argument based on observations of reality just like we do. He saw a rock and knew it was a thing and not nothing.
We simply cannot argue the opposite of this concept because it’s impossible.