Even a vaccuum has physical properties which affect both space and time. And if matter is a fluctuation of a vaccuum, then the vaccuum contains something, even in the abstract, which makes it no longer a vaccuum. And if there are fluctuations in spacetime, then there must first be the concept of existence.
Otherwise you couldn't be sitting here talking about it. Or standing, or whatever. The fact that I can discern the difference between sitting and standing is yet one of the infinite examples of there being reality around me.
Only by blinding yourself to reality can one say that it does not exist, and then one is stating that they do not exist, which is the same as saying "this statement is false". There's an inherent flaw in your reasoning, which negates the validity of your assertions.
One cannot say that they do not exist, unless they exist.
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