The story in question, reviewed how specific encryption programs have changed or failed to change in light of snowden. That is all it can speak to. We know nothing of the relative rates of use of these tools before and after snowden. Their use may have spiked dramatically post snowden, and we would never know.
Snowden also revealed information on phone tapping and spying at the service provider level, and many, many other forms of communication. The article did not speak to the effect those had. Its entirely possible that the they have taken counter measures against these as well. Its also possible that they may have moved with the crackpots in our midst to more secure service providers that are believed to be outside the reach of US intelligence.