Have you actually ever read any of the Linux source code? I find it pretty hard to read to be honest. There are barely any comments and the ones that are there are often not very helpful.
In this case, I've never read the sources, so I have no idea if the complaint is valid.
Yeesh. I must either be getting old, or everyone is significantly more busy than I am. I find that I always have time to at least locate any official documentation for the thing that I'm working with.