As it says in the paper, they already did the research with less limiting prompts. All models were tested with another prompt that gave only the question and no

As it says in the paper, they already did the research with less limiting prompts. All models were tested with another prompt that gave only the question and no further instruction, and a third prompt that asked the model to consider its answer carefully. The correct response rate chart doesn't even use the results from the concise prompt.