To quote the article:

>researchers have identified meteorite hotspots known as “meteorite stranding zones”. These are areas where the local geology, the flow of the ice, and climate conditions promote the aggregation of meteorites at the surface of the blue ice.

The flow of ice is something that deserves far more Emphasis here.

Antarctica is basically covered by one giant glacier, which flows from the middle to the rim of the continent. Any meteorite falling onto the ice sooner or later ends up at the edge of the glacier.