Other people have said it, apologies for pinning it on you. :)
Those don’t talk just about left/right bias, but also about accuracy and correctness, which is more why I was referencing the fact checkers.
I guess this depends on what you mean by “propaganda” to a certain extent. The usual usage of the term is to refer to information that is simply biased or misleading, advanced in service of a particular political point of view. In that definition, I would say VOA is not propaganda; it reports truth, even when the truth is uncomfortable to the United States or its government.
That said, it is certainly doing so in espousing the values of freedom of journalism and information and hoping to inculcate those values in its listeners by virtue of example. If you think that mission is itself American nationalistic propaganda then I guess yeah, you could say VOA is propaganda. I don’t think this is a commonly-accepted definition of the term however.