Chu Li had already read Mo Cuicui's mind and found out that many of Qin Huaichuan's friends had acquired the Earth Matrix and Reincarnation Scripture from him. However, none of them were successful in their attempts at cultivating it.
If the Earth Matrix and Reincarnation Scripture had been that easy to cultivate, it would not have become the unique martial art of the Reincarnation Temple. Therefore, while this request of his had seemed rather unreasonable, Chu Li knew that it was, in fact, not a difficult thing to do for Qin Huaichuan.
Since Qin Huaichuan had never thought very highly of Chu Li's abilities, he had assumed that Chu Li would not be capable of cultivating the Earth Matrix and Reincarnation Scripture anyway. This was why he had agreed to transmit the scripture to him so readily.