The encoding used by GPT-2 and GPT-3 greatly obscures many of the textual properties of words. This at least partly accounts for why it has so much trouble with meter, rhyme, syllables, and some math.
So it didn't figure out the syllable counts and it mistakenly thought the haiku should rhyme. But it's amazing that we have come to a state where the critiques are so minor.
The logs were in a mess, But the expert could see, That the database was in distress.