No, but as Christopher Tolkien himself later regretted the publishing of the Silmarillion in it's current form as unrepresentative of his father's views on the mythology at any given time, borrowing as it did material from the very latest writings, the very earliest writings and even some material written by Christopher himself, it's hardly to be thrust forward in equal authority with other material he wrote.
And, lest I remind you, you are saying I can't possibly be speaking with authority on the issue since we don't know for sure what, if anything, Tolkien would have published on the issue had he lived a little longer. Yet, you are the one who stated very matter-of-factly that elves were the ancestors of orcs earlier in this thread, which you yourself now admit cannot be firmly established.