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I'm looking for an old post where Eliezer makes the basic point that we should be able to do better than intellectual figures of the past, because we have the "unfair" advantage of knowing all the scientific results that have been discovered since then.
I think he cites in particular the heuristics and biases literature as something that thinkers wouldn't have known about 100 years ago.
I don't remember if this was the main point of the post it was in, or just an aside, but I'm pretty confident he made a point like this at least once, and in particular commented on how the advantage we have is "unfair" or something like that, so that we shouldn't feel at all sheepish about declaring old thinkers wrong.
1. https://www.lesswrong.com/posts/96TBXaHwLbFyeAxrg/guardians-of-ayn-rand
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(Not sure if the material is accurate, but I think it's the post you're looking for. There could have been more than one on that though.)
2. https://www.lesswrong.com/posts/7s5gYi7EagfkzvLp8/in-defense-of-ayn-rand
References 1.