At the moment they aren't, but they used to be and very well could be again in the future. Also, that link says nothing about Google not "reading it, learning from it, modifying it and hiding some of it from you", when it comes to your emails, which is GPs stated concern.

Google still saves and parses every email it gets and likely uses that data for a number of purposes. No longer directly targeting Gmail ads with it really doesn't do much for people who are concerned about Google and privacy issues.