The pork supply gap is too big for any national reserve, the gap is 20 million tons. That's why China is importing Canadian pork despite the Huawei situation.
Compounding the matter is the party bureaucracy effectively killed most small farms since villages were completed sealed off, chickens weren't allowed to be sold (or killed in fear of bird flu) and feeds can't be sent in.
The pork shortage drove the chicken market to overheat last year and just right when they were suffering from oversupply during the winter this virus hit. Double whammy.