I think you may have misunderstood - it is the Larsen C shelf that is held in place, not the iceberg that it calved: An iceberg the size of Delaware is now in

I think you may have misunderstood - it is the Larsen C shelf that is held in place, not the iceberg that it calved: An iceberg the size of Delaware is now in motion. If it follows the path of previous icebergs from the Larsen Ice Shelf, it will drift north along the coast of the Antarctic Peninsula before heading northeast into the south Atlantic Ocean, according to NASA.