Trump's own DNI couldn't come up w/credible links of Chinese election interference. They issued a memo trying to pass this off as fact by saying the "Chinese & Iranians prefer Biden" and then equivocating it to actual Russian efforts. The Chinese have online trolls no doubt, but their efforts so far has been in trying to paint a rosier picture of China's internal and foreign policy in dealing with Hong kong, trade, Uyghurs, etc...