It is not the 2019 price point/ specs, it's the 2021 price point. You can still pre-order it at those prices.
Seems silly to assume Tesla would continue accepting pre-orders advertising a price they cannot meet. If they couldn't meet it, they would presumably either take the site down or increase the price.
Every day they advertise a price they know they can't meet increases the pain and uncertainty they will have to deal with later on.
They are building half of an absolutely massive multi-billion dollar factory specifically to make this truck. They just installed a billion dollar machine to stamp out the rear end for it. Are they going to invest all this money and effort only to cancel it? Or shoot themselves in the foot by changing the pricing at the last minute?
Right now Tesla has a pretty clear picture of demand. If they change pricing significantly, how many cancellations will there be? This whole idea is just weird.