So it's by no means the earliest essentially-complete collection of manuscripts found. That said, it is still in sparse company. As far as I can tell, the next major complete manuscript are a few copies of the Bible dating to mid-4th century. Complete versions of things like the Odyssey and the Iliad date only to around 1000.
This is what the article claimed: the DSS are "some of the oldest surviving documents on earth."
Again, the article stated a simple truth: the DSS are "some of the oldest surviving documents on earth."
That is a factually true statement.
The parent commenter objected to this statement. I corrected him.
Now you are trying to correct me by saying there is a some surviving literature from before the Bible was written. I've made no claim otherwise.
But even if you classify stone and clay carvings as documents, the statement is nonetheless true: the DSS are "some of the oldest surviving documents on earth." There are some fragments that are older (e.g. a clay fragment found in Jerusalem [0] dating to 1400 BC), yet the DSS remain as some of the oldest surviving documents in existence, and they comprise more than a mere fragment. For example, the DSS contains almost all the books of Psalms (the longest book of the Bible) and several copies of Isaiah.
This is an interesting find because it suggests there are more caves than previously believed, which may produce additional ancient witnesses to the historic texts of the Bible and other Jewish religious documents.
[0]: http://www.jpost.com/Israel/Oldest-written-document-ever-fou...