In this case {KREFU} is supposed to be a metalinguistic comment; the fact that it is strangely written makes that more clear than if it had been written {krefu}.
(Hypocritically, I have a stylistic choice to argue about: I would have, instead of {lo jukpa lo cifnu cu kansa}, said {lo jukpa .e lo cifnu cu kansa}; in the original text, the line is "the cook and the baby joined", not "the cook joined the baby")