Why should they deny those payments if they weren't illegal? It's the right wing that's been making claims that they somehow were illegal or that some of the money went to Joe Biden. And the payments weren't from the Chinese govt but from a private company. In fact, the head of the company is currently being detained by the Chinese govt on the grounds of corruption. So it seems very unlikely he was an agent for tem.
As for the allegations, I guess we have to wait and see. Agan, David Weiss, a US attorny appointed by Trump, is going to cover up Hunter Biden's crimes? Seems unlikely, too. As well as Garland perjuring himself. Right now, they're just allegations.