Not really a bombshell though based on the January 2nd date.
Someone has done some good work here (video below) on the actual timeline. He's an American who has lived in China for a few years. He reads and speaks Chinese very well. (He's not a pro-Communist spokesperson, and has even been involved in the same types of large anti-government protests that thousands of other Chinese citizens have participated in.)
Even the article on Xi's knowledge of the epidemic actually appears to be a