I think this is wrong if we expand {ko} into {do ko'oi}. Then we get two attitudinals not connected to each other. Hence the meaning would be "I state that you eat it (kidding). [Please], eat it!"
Hm this seems difficult. My opinion is that the elided attitudinal before {zo'o} is an elliptical illocution that *usually* is {ju'a} (statement/assertion), but {ko} then overrides that with {ko'oi} (imperative/hortative).