"The last enemy that shall be destroyed is death"
--1 Corinthians 15:26
(I wonder what Eliezer would've made of it - as far as I know, he never read Deathly Hallows and so never read about the tombstone.)
Well, he knows about the Hallows themselves via wiki-readings. I think he would have written the story the way it is whether he knew about the tombstone or not, but I put fairly high probability that he does know about the tombstone and how fantastically awesome an endcap it's going to be on the story.
Here's the new thread for posting quotes, with the usual rules: