Let's say it's "somewhat dated." Some things do need to be fixed (such as flex and the guides on animal hunting changed due to these tweaks), the rest is still pretty accurate. For that matter, the animal hunting is all that is really useful here as the rest is fairly well organized on the wiki now:
http://ringofbrodgar.com/wiki/Combat_Actions. (Note for newer players: I didn't fully browse the page and links for accuracy. It is a community ran site, so information is only updated if players know the information and someone logs in to correct it.)
Opinions expressed in this statement are the authors alone and in no way reflect on the game development values of the actual developers.