[Geee]

I find it weird that they consider "particles which fluctuate", but these particles are a part of the universe already. There's nothing to fluctuate when the universe doesn't exist.

However, if something fluctuates somewhere eternally, then I'd say that it's possible that this random fluctuation causes a very simple computer to form which is able to update it's state based on some simple rules, which results in complexity, i.e. our universe. This way you wouldn't need complexity to pop up spontaneously, but just a simple thing which is able to simulate a complex thing.