If you're really "skilled at" or fluent in the flat earth perspective, then content which presents a wildly different perspective on the same topic would get labeled as highly nutritious (or at least this was the intention). I understand your concern, and see how "advanced" content from the same ideological background might make it there, though I think there must be a point where you can't get more advanced at it, following which related content will fall in the boring sector, leaving the conflicting takes in the sweet spot (in theory).
It's also relevant to highlight something mentioned in the discussion towards the end, that actively moving across the diagonal channel (i.e. consuming both challenging content in a familiar topic, but also accessible content in unfamiliar topics) might be a further improvement, though this is not explicitly implemented in this initial version of the thing.