Incidentally [since it came up in the thread] I accept what Galadriel says in Fellowship of the Ring about Nargothrond and so on, and what it says in The Road Goes Ever On about her movements [crossing the mountains of Lindon]. Both these works are published by JRRT himself in any case [whether or not they seem to contradict each other].
The first doesn't state what mountains are being referred to, even if readers think they know because they know the details of the external variations, nor is The Silmarillion published by the author, if something from it should contradict something Tolkien already published.
I agree one might wonder why Galadriel would be referring to 'mountains' that are, at the time of her statement, possibly long sunk beneath the Sea, but the timing reference is to the fall of Nargothrond and Gondolin too... not exactly events that occurred lately, especially from a Hobbit perspective.
I do think [my opinion] that Christopher Tolkien made an effort, at least, to be consistent with The Lord of the Rings. And in my opinion the posthumously published texts are different animals than author-published work, especially where seeming or 'obvious' inconsistencies are concerned.
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