Your author can’t understand the difference between the Big Bang theory and the Cosmic Inflation theory. The cosmic inflation theory explains only the relatively uniform distribution of galaxies amd galactic-mass objects; many secular physicists have always had a problem with it.
That said, the uniform distribution is currently unexplained, and that drives scientists batty.
Galaxies and Galactic-mass objects have to be uniformly distributed throughout the Universe, otherwise it would tip over.