I guess they found the counterfeit money there and are using that to show what the counterfeits look like?
No, such notes are printed by the banks over there, specifically to use in training their staff. Translating the Chinese text on a training note usually also includes "property of the bank - do not remove", or something similar.
So what is the point of having worthless paper money used for training purposes? Wouldn't the real stuff do the same thing and be worth something?
It's deliberately designed to be "worthless". They're training hundreds of tellers-in-training simultaneously, in the art of operating a teller window: deposits, withdrawls, counting money and keeping track of their tills. Now suppose some of the new trainees come up a few hundred short after the training exercise - with training money, the worst that happens is a "Fail" and the student sent home in disgrace for incompetence, because the bank can know for sure the trainee hasn't simply pocketed the fake cash for themselves.
But if they used real money, people who knew they would fail (and therefore would not be getting a job at the bank) might be tempted to pocket some money, just to tide them over until the next job interview. And the bank might never figure out how much of the discrepancy was due to their poor teller skills, and how much was outright theft.
It is only after the trainees prove their skills with fake money that they can move on to practising with real money.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis