I liked the paper, and think what they’re doing is interesting. So, I’m less negative than you are about this, I think. To a certain extent, saying writing a full sentence with at least one good candidate rhyme isn’t “planning” and is instead “maintaining multiple candidates” seems like nearly semantic tautology to me.

That said, what you said made me think some follow-up reporting that would be interesting would be looking at the top 20 or so probability second lines based on adjusting the rabbit / green state. It seems to me like we’d get more insight into how the model is thinking, and it would be relatively easy to parse for humans. You could run through a bunch of completions until you get 20 different words as the terminal rhyme word, then show candidate lines with percentages of time the rhyme word is chosen as the sort, perhaps.