This is just BS intended to impress the clueless with an interpretation of Montevideo convention that no signatory state, or international law accepts. Artificial installations and uninhabitable territories cannot be considered as territories sufficient for statehood.

Being stateless (flagless, without national character) means that any state is authorised to exert jurisdiction over a stateless vessel.

While this is essentially a ship in international waters, I wonder what happens if they make enough money to become a precieved threat