Given the markets for spec shares and the high CAPEX requirement here I see it all as a positive. If they hadn't been buying the share price would be 10 - 13 cents I think.
Dingyi have done a great job of tightening up the register. Very professionally done so far. If they decide to keep buying up to 20% prior to making a bid the share price will be ~30 cents easily. So they might not even wait until they have 20% to make the bid because the danger is the price will be too high from which to launch the bid. Better to bid from a lower price to make the offer appear more attractive.