It’s hardly instigated the mind-blowing epiphany – the realisation that it’s all fake – which the proponents of Discordianism had originally intended.
The article doesn't emphasize this quite right.
The key insight of Discordianism is that all of human society is "fake". If you can kick it, it's real; if you can't kick it, it's exactly as real as Eris is -- which is to say, the way people behave is in accordance with the way that they truly believe.
The first level of Discordianism is to think that Discordianism is a joke.
The second level is to realize that it's true.
The third level is to realize that it's a joke that teaches you that everything that exists in and shared between minds has the same ontological basis: Discordia, Islam, Christianity, the US Federal Reserve System, Google -- they all exist because people believe that they exist and behave in ways that indicate that belief.