The comment is too short, apparently slightly off-topic, looks like self promotion and give no reason to look to the linked content. But as you said, this is a good comment!

How I would rewrite this comment (with some parts stolen from the abstract and some parts just invented):

I love copy & paste! I think that the use of programming abstractions like functions and macros has inherent cognitive costs. A few years ago, as part of my research we proposed "Linked Editing": A technique for managing duplicated source code with the help of the text editor. We implemented it in a prototype editor as a XEmacs extension. More details in this article: http://harmonia.cs.berkeley.edu/papers/toomim-linked-editing... and we made a video of the editor: http://youtu.be/1wo_7MTdWWI .

P.S.1 I still prefer refactoring to this kind of multiple edition. I use Racket, so I love functions and macros. But sometime they are very complex to edit, so perhaps sometimes this multiple edition can be a good idea.

P.S.2 Another possibility is that some users are too eager to downvote. I saw many good comments downvoted, but usually they bounce later.