I really don't think I was doing anything especially clever and it was running at 32% for me over 50 samples. That's much worse than chance.
If you chose at random and it guessed at random, it would get 32% about 1% of the time. So worse than chance, but not surprising that it happened to at least one HN reader?
Anything significantly different from 0.5 is still clear evidence your choices are biased. This distinguisher gets it wrong, but the point is that the bias is detected. A distinguisher that took the choices of this one and inverted them would have a much better than 50% success rate.