I don't think I have the same understanding of what the word "transparency" means. To me, transparency means "show me what you're doing", not "change what you're doing based on what I tell you". If Meta is truly not doing anything with their algorithm to intentionally favor one side, I don't understand why you're claiming that this would lead to them needing to change the bias.
I'm completely confused about your analogy to song shuffling. I disagree with your characterization that permuting a list randomly isn't "truly random" in the way that selecting an item from a list randomly is, but even ignoring that, I'm completely unable to figure out what you think the equivalent of that is for an LLM.