New Tolkien book coming!

[Galin]

Perhaps Tolkien had recently read Appendix F concerning what Eldar meant

Even Christopher Tolkien seems to have been paying Appendix F its due when compiling his "List Of Names In The Tale Of The Children Of Húrin":

"Eldar The Elves of the Great Journey out of the East to Beleriand."

Pretty much agrees with Tolkien's published -- never revised -- Eldar: Elves of the Great Journey Over Sea > plus the Sindar "only" -- or "West-Elves" (compare "to Beleriand").

Of course in his introduction to COH, Christopher Tolkien makes the distinction between Eldar and Avari, where his father's distinction in the Appendix was between West-elves (the Eldar) and the East-elves, in any case. But even so, The Children of Húrin entry for Eldar is, for me, interestingly different from the constructed Silmarillion entry, and the chart (The Sundering Of The Elves), which reflect posthumously published ideas.