Yeah, that's kind of the point.
Look at how the lefties are behaving at the "news" that Biden won. They're dancing, celebrating, putting together blacklists and promising to punish anyone who dared to support Trump (which is even being done by members of "the Squad," actual congressmen are promising revenge on people for supporting Trump.)
If you were China, how would you go about setting off civil war in the States? Would there be any way better to do it than by deeply dividing the country with their media and then rigging the voting to make it so that Trump would win on election night, then Biden would magically overturn those numbers with a massive, preposterous number of mail-in votes? All for the same candidate and all designed to be thrown out by the recount?
They are headed straight towards bigger riots than George Floyd at this point if not outright civil war.
Co-incidentally, it's the worst case scenario prediction from all simulations which means that anyone wanting to plunge the States into anarchy wouldn't have been trying to rig the election in a way that wouldn't be discovered, they'd be trying to rig the election in a way that would be discovered.