Analysts long assumed a Middle Eastern blockade would cripple China due to its reliance on imported oil, but that assumption is dangerously out of date. Having spent years hoarding strategic energy reserves, increasing overland Russian imports and cultivating diplomatic leverage, Beijing has engineered a position of considerable strength, which it has been using to its advantage.
Whether they got the oil from Russia, Iran, or the US. And regardless to whether they have huge oil reserves or not.
Through their actions it’s pretty clear they aren’t really worried about the straight or oil coming through the strait.