tl; dw: rear wheel axle has a brake dividing the axle between front and back. Brakes are essentially variable torque transfer devices between two rotating members. To allow more torque to the rear than front, the gearing from front to back is fixed to increase speed by 0.7%, shifting the balance towards the rear when the front-rear axle "brake" is fully engaged.

Now if Toyota could just figure out how to manufacture enough cars to meet demand. Just kidding. They can, but their profits are up under this "shortage" regime, so expect it to continue for as long as they can milk it.