We have a ‘lumpy’ universe....................
Yes. The problem (well, one of the problems) with the article is that it misunderstands the cosmological principle and finds a conflict where there is none.
In fact, the cosmological principle says that the universe is the same everywhere in that the same laws of physics can be observed from any vantage point. There is no guarantee that the same distribution of matter is to be found in one place as another.