What happens if Cast Down into the Briny Deep sinks a board where a land is under Absolute Stasis?

What happens if Cast Down into the Briny Deep sinks a board where a land is under Absolute Stasis?

If you want and you have a convenient coaster or other object that can represent the Stasis'd land, then the Stasis'd land survives. If it is disjoint from the rest of the island, consider it Range 2 from the land(s) nearest to it, per the Archipelago rules in Jagged Earth. If you don't want to do this, or have no convenient way of representing a single land, then Cast Down into the Briny Deep overwhelms the Stasis, ending its effects and affecting the land normally.
If by doing this you create a land with no adjacent lands, see this FAQ for how, e.g., Blight Cascades work.
Similarly, if the Deeps aspect of Ocean's Hungry Grasp creates a land separated by ocean from the rest of the island, consider it Range 2 to cross the ocean for all purposes, including (e.g.) Growth.