You don't understand the totally corrupt Chinese legal system. They are only interested in prosecuting fraud against their own government or important officials. The don't give a s*** about the rights of ordinary people. Ripping off foreigners is actually condoned. If you are rich and well enough connected you can literally get away with murder.
IMO Mr Xu would not be affected if the money was shown not to exist. SBB (which has no Australian assets) would be placed into administration but the Chinese business would remain unaffected. There would probably be no police investigation in China. The Chinese would almost certainly refuse too cooperate with Australian authorities.
Chinese companies listing on foreign stock exchanges know that they are essentially immune to prosecution in China and unlikely to suffer any serious personal financial consequences if they engage in fraud.
DYOR.
SBB Price at posting:
2.3¢ Sentiment: Sell Disclosure: Not Held