Not only the jurassics. On the classic 737, AB decel control is also done programmatically with no feedback loops (outside of what the anti-skid does).
For each setting of auto brake, there is a uniquely programmed ramp up of brake pressure, done in steps, all of which is based entirely upon pre-calculated deceleration rates. After the ramp-up, about 3 seconds in, the max pressure per AB selection level is then simply held.