No, at least not in this case. The winemaker told me they were all there naturally. Minerality is a nice component to wines and many vineyards have sea bed deposits in their soil. Sand, shale, Galestro (a sort of sea bed gravel hybrid) it’s interesting even if you’re not a wine geek.
One vineyard in Montalcino excavated an ancient whale fossil on their vineyard several years ago. That vineyard was about 400 meters ASL.
Unfortunately, all it "proves" is what we already know - that coastal regions undergo upheaval over geological time. That took place long before humans were on the scene - millions of years ago. Lots of seashells on top of mountains all over the world - from Everest to the Appalachians.