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Are quantum fluctuations "nothing"? Can "nothing" fluctuate? What is fluctuating?

"A Mathematical Proof That The Universe Could Have Formed Spontaneously From Nothing" - https://medium.com/the-physics-arxiv-blog/a-mathematical-pro....

"In each of these cases, they find a solution in which the bubble can expand exponentially and thereby reach a size in which a universe can form—a Big Bang."

So, it's contingent upon a "bubble" forming, which is not nothing but rather something. They have not claimed to prove how the universe formed spontaneously from a bubble, not nothing.

It's the discussion between physicists and philosophers from my second link. For philosophers the nothing can exist, but for physicists the whole quantum thing, makes the nothing of the philosophers a non reality...

I think the idea is that ‘something’ must exist by necessity. Sort of like how logical truths are eternal and have no beginning: the laws which make up matter appear to follow mathematical (logical) rules, so maybe matter in some sense is eternal as well.

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