Windows NT (as a usable thing available to the naive general public) didn't exist before Microsoft built it, so it was technically correct to call it new technology technology. In the same vein, this is arguably new compression technology.

The above being said, my reaction to the article's key point was "you've been shipping forward and reverse diffs this entire time???"

I guess my point is that it's kinda sad that it's most correct to generally describe things like this like as "new technology", because customers who've never seen something like it before don't apply any distinction between that and the idea having existed for however long. </rant>