There is no anti-mothball clause. But the section on a production decision, in the jv agreement, states what is required for the production decision.

According to the list the optimizations should be the only thing outstanding.

So let's say optimizations are done and given to the committee by March. At that point they have all the required documentation for a decision. The next possible delay is saying they want to go back to the FS stage. But after that there isn't really anything else one could use to delay. (at least according to the jv agreement)