From the article:

Sang has no illusions that even a clever cryptographic font—which you can use in email messages to shield them from snoops and font-recognition bots—will remain encoded for long. They're not meant to be long-term tools with which to combat the NSA. Rather, he views them as an awareness-raising measure.

"This project will not fully solve the problems we are facing now," he writes, " but hopefully will raise some peculiar questions."