I mean it's real Chinese income backed by fake paperwork. There's PRC capital controls, rich PRC national who buy RE abroad are going to do it via laundering services and has been for decade+. Banks are fine with this and have dedicated branches in diasphora area to handle because the money is good and reliable. Sometimes rich Chinese immigrants also do odd jobs to fill time, bored aunties with multi million dollar mansions in Richmond working shifts at River Rock Casino. It's a bizarre world.
Try 25 years. Started right after the Hong Kong transition from under the British rule.