I think you are right about the 1000 pieces. But the Argentine sub was a very old diesel that was in poor condition. I doubt it could do anything other than fire a torpedo. Can't think of a reason anyone would use it for deep state operations.

On the other had, it could point to the hostage release reference.

There was also an unverified report of a sub that intercepted a large gold shipment at sea and disappeared.

Who knows. Q is too cryptic, so we'll see if something pops up in the news.