No, it just means he's not the impartial expert on the facts that some seem to be imagining him to be. I'm sure the prosecution had an expert witness who could have written a post saying "Aaron would have been found guilty."
True. But if we assume everyone put on the stand in a trial is a paid shill, lieing for one side or the other, we also have to assume that that the court system is a sham and there's no point in a trial.
I'd rather assume that we can find smart, honest experts who happen to disagree, and that we can trust what they are saying to be their view of reality.