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Disco 5 went to the Active Driveline (iAWD) when the facelift came for the 2021MY. The transfer case is completely different, and the infinitely-variable locking center differential has been replaced by an electronically-controlled clutch pack that mimics the old center diff, and has a variable torque split that can send as much as 50% of the torque to the front axle. It can also completely disconnect the front axle and bring the front propshaft to a complete stop while driving in certain situations to increase fuel economy. It is always AWD when driving from a stop, under 21 mph, over 100 mph, at temperatures below 37°F (3°C), and if you're off-road. The system is also proactive, so whether your lights & wipers are on will affect the AWD system's operation.
Another benefit of this new system is if you break your front axle, you will still be able to get back to pavement and drive home, as the torque is always sent to the rear. Hell, you can still drive the vehicle if you remove the front axle. If you broke any axle on the old system, you wouldn't be able to move.