But that doesn't make sense. The AWD and the RWD versions of the car have the same LR battery system: 4416 type 2170 cells. They would have the same 0% SOC critical voltage. The difference is in the efficiency of the two vehicles.
The AWD has an additional front motor, which adds weight, but which does not add regenerative braking (because of the type of motor.) The RWD has the same battery and rear motor, so it gets all the regenerative braking, but has less weight to actually move around. Ergo, it will get more miles out of the same amount of power.
If I have an AWD, and my friend has a RWD, and we both charged them to 100% last year, they would both indicate an estimated range of 310 miles. If we both drove them (gently) until 0%, I would have driven about 310 miles, but my friend would have driven about 325 miles, because my AWD is less efficient.
Now, if we both charge them to 100%, mine will estimate 310 miles, while my friend's will estimate 325 miles. They both have the same actual range as before.
This makes logical and consistent sense. If they had found a way to safely get power out of the battery to a deeper level, or more efficiency out of the inverters, there's no logical reason a range increase not to apply to the AWD versions, including the Performance. An improvement in the abilities of the batteries or inverter ought to apply across all models with those batteries or inverter: note that the same firmware upgrades that brought the change in estimated range also brought a 5% increase in peak power across all Model 3 vehicles - Performance, AWD, and RWD.
Note that your particular vehicle's estimated range will also changed based on your battery's current condition and environmental factors (which are reflected in the estimated battery capacity) and, perhaps, based on how you tend to drive (which may show different ranges for different driving styles; i have been unable to find any confirmation for this.)