The first link in the article is better than the actual article.

They don’t think it a modern loss.

https://greekreporter.com/2026/04/16/ancient-greek-coin-troy...

Berlin specifically has a few meters of soil separating it from that period, but that's not always true. I've excavated millennia-old sites barely centimeters under the surface. Others are buried under meters of soil overnight. There's also natural processes moving things around in the soil (e.g. rabbits, freeze-thaw cycles), and human processes (e.g. tilling).

I wouldn't jump immediately to modern collector, nor does the article.