Does the bike track properly? Can you take your hands off the bars without it taking off for the weeds?
From what I know, Salvage Title means that an insurance company has paid a claim for the total value of the bike. This could be after a major accident, or a theft where the bike was recovered after the claim was paid and the Insurance company took possession of it and auctioned it off.
Usually, if the bike was totaled in an accident the frame will be tweaked and the bike won't track properly. Those bikes normally wind up being donors, unless they get another frame. The "new" frame is probably used and carries a clean title with a different VIN. A bike built on that frame will not have a salvage title because it was scrapped with the old frame.
Since your bike has a good frame and shows no collision damage, I suspect it was stolen at some point and wasn't recovered until some time after the insurance claim was settled. At that point, someone probably purchased it at auction and a salvage titlle assigned because of the break in legal ownership. It's not a big deal, just a little more paperwork and a search of stolen VIN's to get it registered. Since it was registered in January, a previous owner took care of the problem for you. Everything is cool and you got a pretty good deal on a nice bike.
My final tip to you is to make sure those nice city cases are secured to the z-frames with straps or rope or you have something that prevents the latch from releasing when you hit a bump. Those cases come off the bike very easily, and you won't notice until it's way too late. I learned that the hard way. Twice.