China, right now, is an adversary of the United States, and the current administration has been doing everything it could to pin the "China virus" on them.
The fact that they are now willing, immediately before a change in administration, to make the allegation in a slightly-more-official capacity means nothing to me. They beat that drum for the past six months with no evidence and no consistent story, and now they issue a statement full of supposition and loose circumstantial evidence. So what?