“it would violate one of the fundamental tenets of the Big Bang model, namely the assumption that matter and energy, on cosmic distance scales, are distributed uniformly in space.”
Who says that’s a “fundamental tenet”? I expect it’s understood as “uniform” only insofar as a massive explosion is “uniform” which in no way insists on a perfectly consistent/smooth distribution, but involves randomness which magnifies variations into larger consequences. On a Big Bang scale, there were certainly random anomalies in the explosion which, on cosmic distance scales, manifest as vast “structures”. Small variations over enormous ranges and long time periods, coupled with long-range forces like gravity, makes identifiable groupings happen.
I’m not impressed with “research” that starts with a tenant of “that’s wrong, if I can insult it I must be right.”
“Who says that’s a “fundamental tenet”?”
Cosmologists. It’s even called “the Cosmological principle”, for pete’s sake, because it is so fundamental!