There's no defined standard for contrast ratios, so they can claim almost anything they want.
In fact, there are so few panel manufacturers you can probably find the same panel on different brands with contrast ratios of 10000:1, 20000:1 and 30000:1.
Samsung's equivalent European model is advertised as having a contrast ration of 30000:1, probably because they can't get away with quoting "Dynamic" contrast ratio here.
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