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Your earlier quote was :
The link that you provided quote Obama saying "And it may be some of their claims are legitimate".If you're talking about the artificial islands, then according to Barack Obama himself, China hasn't violated international laws.
They are completely different things. Obama is simply acknowledging that some of China's claims may be legitimate. I don't think anyone has ever disputed that there may be legitimacy to China's claims in the SCS just as there may be legitimacy of claims by the other claimants.
My comments are specifically about artificial islands.
You only listed one of the pertinent sections of international law, but since the International Court of Justice hasn't rendered any decision on Philippine's law suit against China. It's not even clear if the ICJ has jurisdiction, You and many others have opined China can't opt out, and that's your right, but the decision is up to the ICJ and until it hands down a ruling, no one could say with legal force China has broken any international law.
You are conflating the issues. UNCOS clearly states artificial islands do not accord territorial rights. It has nothing to do with arbitration which concerns dispute over sovereignty.