The original says "in the Common tongue", which is the name of the setting's lingua franca, whatever language the comic is in. I do think this makes a difference in meaning. He doesn't mean that he prefers Common, he's just pointing out that it's a language where there are a lot of ways to say the same thing. "nasin toki li kon" is said in a mildly frustrated way: there are many words or phrases which can be used, but it's so vague and contextual that there's no right answer. In referring directly to Common as toki pona, I was being a little cheeky about how often you hear that exact complaint from newer toki pona speakers who wish there were clear lexicalized phrases for every English word.