Dividend policy is the PERCENTAGE company pays from it's earnings/cash flow in the future as dividends. Very common to have that mentioned, but it's nothing to "announce", just basic information.
Siaf ABUSED the NON-BINDING DIVIDEND POLICY to throw out exact dollar amounts to fool the investors/shareholders/market, in other words to manipulate the share price up.
In a way they don't have to pay you, more so they never should have "announced" anything in this way.
Just goes to show how crooked the company is.
I hope they will get severely punished for this.