Discussion of “Estimating the Effects of Climatic Variability and Human Activities on Streamflow in the Hutuo River Basin, China” by Shizhang Peng, Wanxin Liu, Weiguang Wang, Quanxi Shao, Xiyun Jiao, Zhongbo Yu, Wanqiu Xing, Junzeng Xu, Zengxin Zhang, and Yufeng Luo