I said that too...I think there is confusion about that.
"Regular" employees will HAVE to utilize the separate parking garage away from the main building. There will be an average of a 20 minute travel time each way for an employee to get from their car to their office. Yes, there are nearly 2,000 spaces under the structure, but those will most likely be reserved and majority of employees will fight for the 6,000 spaces in the exterior garage.
Many will actually utilize the Apple transport system of buses that will pick them up near their homes and drop them at the transportation hub near the parking structure.