Yes there's an SFT o-ring in there. As you've mentioned the firing operation is similar to a Shocker, so the cold weather performance will likely be on par with a Shocker, which tends to be on par with similar spool-based markers also as you mentioned. Generally this means increasing your frequency for maintenance, possibly switching to a softer SFT o-ring (at your own risk). More frequent regulator maintenance also helps although that varies from situation to situation (and also depends on the condition of the reg coming into the cold weather).
FSDO is a tricky problem though. It's a problem that is sometimes caused by the bolt...but sometimes it's caused by the electrnoics, and sometimes caused by the solenoid. There's actually a number of totally separate causes for this drop problem, which all end up producing the exact same symptoms in the end (which we call FSDO). In my experience the dropoff is often related to the solenoid, either by undergreasing or by the pilot valve becomming dirty or overgreased. Moisture can accumulate there as well, causing issues. The setting on the board is designed to guard against those things more than anything related to the bolt assembly. Fortunately the marker uses a Parker solenoid which tends to be pretty good on FSDO, and some replacement parts are easy to find for them. Shockers using the more expensive Humphrey solenoids would often come down with FSDO as a result of the moisture issue from above.
One of the other things about this marker is that it uses a mroe generic solenoid design than Shockers and Nerves, so there's also the possability of using other solenodis here as well. I can think of three or four solenoids I have sitting here that actually use the same port layout and will theoretically mount up to the Luxe's manifold. Question is will they fit inside a Luxe frame...not sure yet since I haven't tried (but you know I will
These days you can't have a respectable circuit board without including some kind of anti dropoff feature like that (lol)
The firing operation is similar to a Shocker with some refinements to the parts layout and interaction. The internals are actually laid out similar to a hybrid between the previous Shocker HE bolts, and the Evolve Shocker bolts from a few years back, combining features of both. For instance the Luxe bolt is fully balanced like the Evolve bolt, but uses additional air volume inside the bolt guide component like an HE bolt. It takes the advantages of both and combines them.
There are other design issues going into the specific layout but I won't go into that. I just feel I shoudl mention that since the HE bolt has some inherant features not present in Evolve bolts, and vice-versa.