Why is Jane's argument that ultimate reality does not exist considered self-refuting?

Jane's argument that ultimate reality does not exist is considered self-refuting because the very statement she makes presupposes a discussion about ultimate reality. If she asserts that ultimate reality does not exist, she is inherently making a statement about what ultimate reality entails—namely, the existence or non-existence of it. Therefore, her argument contradicts itself; in claiming that there is no ultimate reality, she is engaging with the concept of ultimate reality itself, which means the argument cannot hold water. This paradox highlights the flaws in her reasoning, reinforcing the idea that ultimate reality must at least be acknowledged in order to make such a claim about its non-existence.