At the risk of receiving downvotes from both flaggers and mod-supporters, I would say that both you and "declining" moderator made mistakes here.

* Your mistake is of using wrong flag. VLQ description says "answer is unlikely to be salvageable through editing" which makes it a very (**very**) bad fit for link-only answers.  
   
Thing is, as long as the link isn't broken and is relevant to answer the question, northing could be easier that salvage the answer by just adding an abstract / summary of the content available at the link. Whenever I do that kind "salvage edits" <sup>([1](http://programmers.stackexchange.com/posts/155445/revisions "example"), [2](http://programmers.stackexchange.com/posts/146856/revisions "example"), [3](http://programmers.stackexchange.com/posts/148431/revisions "example"))</sup> it works like a charm.

* Mistake of the moderator was that they either  
&nbsp;  
were unable to recognize that your flag was submitted in a good faith (link-only answers are [discouraged](http://meta.stackoverflow.com/a/8259/165773 "as explained eg here"), you are right),  
&nbsp;  
or ignored the official guidance in [SE Community Moderator Newsletter](http://moderator.stackexchange.com/2011/09/september-2011-newsletter/ "see section 'Flags Too Often Marked [declined]'") to dismiss flags as helpful in case of good faith submission.