Theory, yes. Observed, no. Cosmological theories depend on the axiom that the universe is isomorphic at large scales. But astronomers keep finding bigger and bigger structures: galactic clusters, superclusters, super-superclusters. And voids -- regions 100MLY wide that are almost totally empty.
The author is working from old assumptions and outdated theories.
There was a repeating structure model from some French astronomers a few months ago. A kind of cell structure that can be found from existing deep space observational date using crystallographic analysis techniques.