That was the list that almost beat me on Saturday. The first one.
I don't think the Swarm is shelved. I think it is not as powerful as it once was but it is still a ligit list.
I don't know; I think the swarm will face a lot of problems in the Wave 2 meta. In my experience, the swarm --by which I mean 7- and 8-ship Imperial lists--succeeds only as long as it can keep its opponent seriously outnumbered. That means it has to accrue kills early and frequently, and also that once the swarm starts to fall behind in the attrition game it usually stays that way.
But defenses are generally better in Wave 2, with Stealth Device and more maneuverable Rebel fighters and the beefy Large ships. That means it's harder to get those early kills that maintain or even improve your advantages. Wave 2 also features better offense, which (assuming it doesn't apply to the swarm, which can't afford the upgrades) means your opponent is able to hit back more effectively and earlier.
So the swarm strategy gets hit twice. Looking back at the list featuring Han + Gunner + Marksmanship, what does the swarm bring that can crack it? The swarm can't effectively skulk behind or through asteroids for cover, which means an early head-to-head pass is likely--and to me that looks like a recipe for losing 2-3 TIEs in exchange for an X-wing, at best.
I'm just tossing out ideas. The list that I KNOW that can beat the Han list can't hold it's own against other lists, like a TIE swarm or a missile heavy list. So I'm looking for other options. The Heavy canon is key. I also don't think you can run a Slave one without it.
I think the swarm brings numbers. So it brings lots of guns, and the ability to sacrifice a ship to a bump to cancel that marksmanship action.