I have never seen any post of mine marked [dead] yet, including when using a private window and not logged in, so I am very dubious about that claim as well. I have had a single one marked [flagged] so far, and I dispute the fairness of that. I think it was a misunderstanding, which is very common.
This is my article, and I tried hard to explain who he is, what he's done, why his work is important, and the context and significance of this.
A duplicate means a copy. Your link is to a different story.