I wouldn't be surprised if they have a mechanism that doesn't let you recline the seat flat when the vehicle is moving. Pure speculation on my part, but I could see some sort of NHTSB requirements they will need to adhere to.
I just entered my info, ordered a 2021 Platinum SCREW with the Powerboost motor. I agreed to pay the invoice, minus any rebates or factory incentives, which I presume will be none. No deposit on the order, I am sure the dealer would have no trouble selling the truck.