This doesn’t address the primary issue: that they had no methodology for choosing puzzles that weren’t in the training set and indeed while they claimed to have chosen puzzles that aren’t they didn’t explain why they think that. The whole point of the paper was to test LLM reasoning in untrained cases but there’s no reason to expect such puzzles to not part of the training set, and if you don’t have any way of telling if it is not or then your paper is not going to work out