Most of his assets are in crypto, and his wife wants them confiscated because she's frightened he's going to run to China, get citizenship by marrying his new girlfriend and never return.
That is not possible in China (no foreigner can "get citizenship" and as I'm married to a Chinese I am quite sure of this).
For sure he can move his BTC to China though (there are several exchanges).
Also - he cannot get legally married in China without a legal document from the US stating that he is no longer married there (so his wife should simply not divorce him if she wants to make it harder for him).