I didn't see any real issues, at this level. That is why I guessed air bags. Typically, a G-body is beginning to show symptoms @ 1.6 short.
I would not worry about it until it breaks loose as the rear unloads. They typically squat on the hit and unload in about 10-25 ft. This car apparently has good rear shocks and a smoooothe power delivery.
Anyway, you can video the launch and slow it down to find out. You probably won't feel it.