I don't understand Colonization very well. Does it mean that you only need 6 units and 2 ships to build a wilderness city?

I take it you speak about the Colonization card from the Hellenization version?
Yes, if Colonization is the only relevant card you hold, and those 6 tokens arrived at those 2 ships, and the ships began the turn at least four areas away, that is the result.

I was about to ask... what the heck is colonization

I've created a new Hellenization forum (and moved this thread there) to avoid future confusion...

Everyone, feel free to use it for questions, comments, sugestions, etc regarding the Hellenization variant. Jon.G (creator of Hellenization) does monitor these forums as well, so he'll read anything you have to say.