This claim would make more sense if first a marketing campaign removed "China" from the name of these seas from history.
edit: some people are complaining that only the name is not enough for a country to build infraestructure around it. What is it different than for example US fourth fleet stationed close to Brazil and Argentine or any other american fleets? This fleet is enough to wage war against any or even all latin america countries.
In face of current developments, I fully support China construction in that vital area for their economy. My country should answer the same way if you ask me.