The statute says that any document which follows this model (XXXX) must be considered prima facie valid. The document in this question does not follow the model. I would highly recommend that Ken talk to a lawyer about what needs to happen to ensure that Mae gets a jury trial if the issue of the living will comes up. A judge might not consider the deviations from statutory language to be valid, but a jury almost certainly would.
An objective determination of the liklihood of critical confusion is very persuasive. I don't know what the result would be, one might be surprised and find that most readers "get it right," as the model; and don't "get it wrong" with phrase 2 reversed. But my spidey sense says that either version will have about the same rate of critical confusion.
Self-correction: A judge might not consider the deviations from statutory language to be valid significant, but a jury almost certainly would.