Earlier quoted context omitted.
You do realize that his posting the TLDR doesn't prevent you from reading the article and having your own opinion, right? Many people do like summaries and I don't think anyone should be penalized for providing them... Assuming they aren't too off-base.
I guess that what puts me off is the "TL;DR" expression itself. It passes a judgment both on the content ("it was too long, so I didn't read it") and the readers of the comment ("since you don't read stuff that's long, here's what it's about"). I'm certainly not criticizing hammock's summary. As these things go, his is pretty accurate. But the best you can say about a summary is that it doesn't really add anything to…
I'm sitting on an HN self post on this topic, which largely follows your logic and expands it a bit more (though not too much for a self post). Haven't been able to figure out if I should post it or not.