I have a 2018 with the same tires, I think.. I was driving through slushy and hard-packed snowy roads recently and for the first time in this car and it performed extremely well. The sand/snow setting noticeably changes the handling of the car and makes driving in these conditions pretty great actually. You'll be one of the most capable [stock] cars on the road for sure, especially if you adhere to basic snow/ice/slush driving practices. On my recent snowy/slushy trip (Wash DC to Richmond VA) there were all types of cars (at least 30) in the ditch of the interstate where it was mainly just packed slush between lanes, and almost no cars on the snowy side roads I used to get around a major traffic/accident area. It made for a pleasant winter wonderland drive and I had full confidence in my Disco. Feels amazing; the reason I got a Land Rover instead of other cars.
Deep snow/mud off road will surely be problematic with stock tires, so if you drive off road in these conditions I'd suggest a more aggressive tread for those conditions. Snow/ice and mud tires ARE NOT the same. Mud tires on ice are far worse than any all terrain tire. Some all terrain tires are snow rated (snowflake icon) and perform well in most mud also. I wonder if they make Duratracs to fit my Disco...? Hmmm...
Pic: The snowy side road. Not very deep, but completely covered with an inch or so. No issues at all at slightly slower than normal speeds and snow/sand mode selected.