https://www.caranddriver.com/feature...res-explainer/
So it shrinks by 6 inches, then grows by 2. So yes that changes the gear ratio but think about it, it also slowly is lifting the car 8 inches right when it needs traction the most. For every action there is an equal and opposite reaction. If I step on a scale with my body squatted 6 inches I will still weigh 200 pounds, but as I stand up fully the scale will register more than 200 pounds.
This is just the tire contraction and expansion, I believe there is also more of the same in the suspension design.
Anyway, getting over 4 Gs of acceleration without any meaningful speed yet from aerodynamic downforce, comes from other sources.