Simply Wrong 
In regards to the changes made by Cernica.  The thought that you are trying to insert (mainstream scientists disagree with most of his theories and methods)is allready addressed in a neutral fashion at the end of the paragraph.  The sentence you keep changing is a seperate and different statement.  While the adjective offbeat in the text 'a propounder of theories on astronomical topics that are considered offbeat by many mainstream astronomers' can be read as referring to topics or theories, it makes more sense to refer there to theories and later in the paragraph to the pseudo-scientific allegations, lest the intro paragraph become POV in regards to the 'wrongness' of his theories.  And making statements (or implications - which your added text definitely does) that he is wrong is definitely not in line with a neutral point of view.