What he's complaining about is the ones that are linking to the final version of the patch, after problem reports, patch discussions and ACKs and such were all in other threads - those threads are typically just "here's the final patch". There's no discussion to be read there. Typically there's a whole lot more that happened before, but that's not what's getting linked in some of these patches.
The intent of the Link: is to link to the problem report, debugging, discussion of the problem/patch... and some do that. But that's not the problem here.
It'd be like a Wikipedia page just linking to itself for reference. There's obviously more information that led to the page's creation... but the link itself is just garbage.