The Jedi Academy on the JK2.net homepage was established AFTER the release of the game, in the last 6 months.
Now if you had read his post you would have seen the following:
...it was started a year ago and i anit seen it since.
This is a strong implication that he's talking about a different "Jedi Academy"
I am aware of 2 or 3 Jedi Academy clans, I know for a fact that at least one of them was around BEFORE the release of JK2. I was recently a member of one of them, but its split since some of us made a new clan with a more unique name. You can find 2 of the JA clans on CTF servers, 1 (the one I was in) plays Guns, the other plays Sabers.