PRC always want to deal SCS issue bilaterally or through committee with members of disputed claimant. However always refuse to discuss it on International bodies, since it will only bring question for it's legitimacy on the claim it self.The main gist of the article is anything that the Indonesian govt does to accommodate PRC plans will validate and / or legitimise the PRC claims
So, PRC will try to bought, threat, and coerced other claimants or SCS bordering nation's on this bilateral/multilateral talks, without involvement on International jurisdiction. They hope by that move they can pressure each of the neighbors one by one.
That's why their officials stand point is to tell non SCS bordering nation's to back off.
There're rules of International conducts that PRC try to override. UNCLOS off course something that they do not want to be involved with for SCS discussion. After all their claim based on vaguely traditional/historical rights.