Nope. Actually, none of the nuclear reactors in Germany are restartable. By now, all of them have had their permit to dismantle for some time. In all of them, they already started sawing apart the less radioactive components and flushing the rest with agressive cleaning agents and sticky goo to get rid of mobile particles that could endanger the workers. Which means that none of the reactor components are in any usable state and would need to be exchanged for new ones. Doing that in an old reactor is more expensive than building a whole new one, and would probably take a lot longer.