Um.... given that the original work was by a Korean, I wonder if in our rush to ridicule, perhaps something has been lost in translation.
Perhaps the intention is to send a message which appears to be digital garbage, essentially using the font as a Caeserian Cypher. PRISM, the NSA, GCSB, GCHQ etc see "Xy kxtrt" but when you view that message using a particular font you see "Hi there".
And given that lowercase and uppercase characters have difference code points, you can even make letter distribution analysis more difficult by employing a different Caesar Shift for upper and lowercase (not to mention rotations that mix non-letter and letter characters etc).
So even if the original effort was not along these lines and really was as naive as the report of the report of the blog post suggests, the essence of the idea has some validity.
i.e. send messages which make no sense when examined as a series of character code points, and which only make sense when rendered visually using a very specific font. Adding CAPTCHA style obfuscation then becomes your last line of defence against snooping, should the authorities render your message using the required font and attempt to OCR it.
The foolishness of that final defence is only that if the snoopers have reached a level of awareness that they know with which font to render before attempting to OCR, then with only a small effort with a few correctly rendered messages, humans could quickly decode the Caesar shift in the font and apply that algorithmically to all other similar digital messages - no need to OCR.