btw, for those who are interested.. One of the reasons why this subject is outdated, is b/c of the results of COBE and WMAP on the cosmic microwave background.
One would expect in a plasma cosmology differing from the standard concordance view, to have a naive 2pt correlation function of the cmb that differs wildly from what is observed (note: this is a semi empirical model, not first principles). Moreover, the cmb would NEED to differ from gaussian fluctuations in a very apparent way. This is not seen, despite just about everyone in the field trying to look for it. If the cmb does depart from gaussianity, it will do it at a scale that almost rules out plasma cosmology.
Moreover, I still haven't seen a model that doesn't predict synchrotron radiation at highly elevated levels at least in some parts of the universe. No tracer of this has ever been found.