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Wight
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Re: History of Middle Earth and Unfinished Tales
I was actually pulling from LETTERS.
LETTER #347 (dated 1972, superceeding yet confirming HISTORY text)
footnote within text by author:
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Quote:<hr> 'The Silvan Elves of Thranduil's Realm did not speak S. (Sindarin) but a related language or dialect.'<hr></blockquote>
The related language is indeed Old Telerin from whence derived Sindarin.
As for which is canon; I think it's obvious now, especially as the page citation you give is related to development of the Appendices of LOTR.
Answers can be found in more than one locale, if you know where to look.
Ask away.
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