Yeah nah. That just means that the top (of the tree) page was modified 9 months ago. Individual pages have been modified much more recently. For instance, you can see that I updated the Tested Accessories 6 days ago, and Tips & Tricks was updated 3 weeks ago. However those pages are maintained by the community i.e. are not official documentation anyway.
I dare say that the official documentation may be a bit sparse. I think the perspective from many has been that effort should be being put towards fixing problems, not documenting them, documenting their fixing, or improving the documentation. However you and many others might disagree.