Honestly, I would expect any experienced web dev to have this knowledge as part of what they bring to the table, especially for a front end dev.

The article is not really stating anything new and there is already any number of similar articles out there basically documenting the same thing. In fact, given her past job experience as VP Eng for SEOmoz, I'm a little surprised at how little insight there is in the post. (Honest opinion, not trying to be snarky).