I’m not sure I can even adequately paraphrase the point of this contest, so let me take advantage of their paraphrasing: “The short version is that an Amazonian tribe uses verb suffixes as a means of indicating the source of their information. Your challenge is to come up with verb suffixes for English to make it easier to know where a person is coming from with what they’re talking about (and whether they’re worth listening to).”
Be sure to read the comments; they’re priceless.