Just skimmed that article...
You could probably use a few things discussed there for small SEO boosts, basically SEO tricks disguised as accessibility features.
I have a few of them done already on my new site strictly for accessibility & usability reasons.
Skip Navigation links: which is simple a [jump] button that is hidden in my Browser css & is the first link visible in my Mobile css & also for screen readers etc.
Saves a ton of scrolling in my 1 column mobile layout & saves screen readers from listening to your whole navigation on every page.
Simply click [jump] & it jumps right to the page content using a basic link/anchor.
I have [back to top] links that are hidden/visible the same way.
I have labels on all of my form elements too.
Good article, bookmarked it for a full re-read soon 
cheers