technical report - Question about hallucinations part

[junior-tsai-god]

We spend extra efforts on reducing hallucination and repetition: (1). to reduce hallucinations, we examine and ensure that the knowledge in the responses is not contained within the model, and eliminate responses that might lead to memorization;
这句话怎么理解，如果知识不在模型里，幻觉不是更容易发生吗