Yes, I don't disagree with that. But I will point out that the literature of the groups that advocate these positions could objectively be called "Western sources" since they originate in the West, but obviously those are not what the people who produce those sources mean when they say that e.g. "Western sources are not to be particularly trusted when it comes to Cuba."

It is actually very hard to characterize a reliable source in a way that does not exhibit any sort of cultural or political bias.