They were pickling Snokes that far back, when Vader was alive?
Not only that, but the Sith fleet was already in heavy production. It shows at least “hundreds” of them completed or near-completed as well as the building-sized chunk of kyber that Palpatine has been using to fuel each ship’s canon. It’s interesting because while the Death Star just used regular, light-side attuned by default kyber crystals and Starkiller Base used it’s (well, Ilum’s) core of light-side kyber, it shows that somehow Palpatine has bled the entire “mountain” of kyber to the dark side and has his minions continuing to torture it with weapons, so it’s screaming loudly and Ochi can barely handle being in the room.
It’s a fascinating issue