Yes. Upvotes come from original, insightful contributions. Descartes', Spinoza's, and Liebnitz's ideas are hundreds of years old and dated.
Not exactly the point - I think the claim is that they would be downvoted even if they were providing modern, original content ... which I would question, even then. We've had quite successful theist posters before, for example.
If you know more Eliezer Yudkowsky facts, post them in the comments.