Seems like you got this figured out, but my RWD 2022 GT1 has an E5 in the VIN, so your agent is wrong.
AWD definitely does not help in cornering. It does help in launches and putting power down.
But the stinger doesn't have electric or active differentials in awds the gts and indigo do have a mechanical limited slip but it still can't actively push power to the outside wheel, the stingers system is still brake based where it just brakes the inner wheel allowing for power to be routed out to the outer .. it helps but it isn't like sh awd or other true torque vectoring diffsCheck out "torque vectoring", it totally helps, and AWD stingers have this. It applies negative torque to the inside wheels on corner entry, and more torque to the outside wheels on corner exit.
Here's the engineering explained on it;