I bid without looking at the explanation, it turns out that it thought 5♦ was a cue bid, not an attempted rescue, although why it thinks that makes its hand good for slam I don't know.
It turns out I was wrong to pull, since 4♠ doesn't make (and goes down 2 if I get my club ruff). But I think I had good reason to worry opposite a hand that couldn't open.
Finally, why didn't it take the club finesse to go down only 2? Just punishing me for my poor bidding? It would only have saved 5.5% of a board, but still... Maybe this was one of those situations where its simulations told it that it didn't matter; since south opened 1♣, most of its simulations put the king there.

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